A while ago, I answered some netizens' questions about electronic dictionaries, all of which were targeted, detailed and comprehensive, and wrote a lot of words. In the end, I was not chosen as the best answer, so I decided not to answer such questions. Since you sent me information consultation, I'll tell you my opinion for your reference.
Let's start with a paper dictionary. Oxford Advanced Dictionary, Longman Contemporary Dictionary and New Oxford Dictionary are different types of dictionaries. The first two are learning dictionaries, which are written for non-native speakers, while the new Oxford is a dictionary for native speakers, which is somewhat similar to the modern Chinese dictionary used by our people. However, the new Oxford is different from the traditional dictionary written for the natives, and the word "new" is meaningful. According to the "generation order" of dictionaries, many features of New Oxford are obviously borrowed from learning dictionaries, such as grammatical information, collocation information and example sentences. According to the page information of the Commercial Press and Shanghai Foreign Language Education Publishing House, the Oxford Advanced English-Chinese Learning Dictionary (6th Edition) has more than 80,000 words and 90,000 example sentences, while the New Oxford English-Chinese Dictionary has more than 355,000 words, phrases and definitions and more than 70,000 example sentences. Obviously, the vocabulary of the new Oxford is far higher than that of Oxford, and the explanation of words is relatively easy to understand, while the new Oxford may be more refined. Because New Oxford is not a learning dictionary in the full sense, it only absorbs some features, so the number of example sentences is less than that of Oxford Advanced. Comparing Advanced Oxford with Longman Contemporary, I feel that Oxford is more academic, which means Longman's explanation may be more plain, but the two books are of the same scale, and the difference will not be too big. I think they are all good. You can choose according to your personal preference.
Let's talk about electronic dictionaries. You may have read some of my answers, but you should know that I used S928. I looked up the word interval with the built-in New Oxford English-Chinese Dictionary, and gave the phrase: after the definition of interval, I gave two explanations and two example sentences (omitted in Chinese, the same below):
The lights flashed from time to time.
The path is marked with stones at regular intervals.
I use the Oxford Advanced English Dictionary (6th Edition). DIC downloaded the word search from the internet and gave the definition of the idiom: at (...) interval, two explanations and three clauses:
Buses for this city leave every once in a while.
Runners start every five minutes.
Burning torches are arranged at intervals along the platform.
If you feel that the new Oxford has not given the examples and explanations you expected, it doesn't matter. Let's take a look at the built-in Oxford Advanced English-Chinese Dictionary (Oxford Intermediate English-Chinese Dictionary). At the end of this word, an idiom is given: at the interval, there are two examples:
I write home regularly.
Plant a tree every two meters.
In addition, we can also see how the built-in Oxford English Idiom Dictionary explains this idiom:
space
At the interval of (...)
1, time between:
Buses for this city leave every once in a while.
Runners start every five minutes.
There is a space between 2:
Burning torches are placed at regular intervals along the platform.
You will find that it is exactly the same as the example chosen by Oxford. Are you satisfied with this query result?
When I first bought S928, I felt a little sorry because celebrities didn't include Oxford Advanced, but after using it for a while, I found that the Oxford Intermediate English-Chinese Dictionary was very good, which could completely solve the problems encountered in my usual study. * * * Collected more than 47,000 words and phrases and added illustrations to more than 34,000 articles. If some words are not included, I will look up the new Oxford. Generally, such words are not commonly used. Therefore, using these two books to study together, together with a verb phrase dictionary, a synonym dictionary, a collocation dictionary and an idiom dictionary, can apply a film title of Zhang Ziyi: Perfect.
There is a sentence in your question that "it is estimated that downloading dic from Oxford Advanced English Dictionary will not be very useful". These. DIC dictionary file was made by netizens, and I began to suspect that it was similar to your idea and unsafe to use. Later, after careful comparison, I can confirm that it uses the same source file as Lingus's Oxford Advanced English Dictionary (6th edition). In addition, Oxford English-Chinese Dictionary for Advanced Learners (4th Edition) In this way, it is more than enough for a celebrity to be a literary star and a good dictionary.
I'm not sure what stage you are studying now. According to your question, I guess you went from high school to undergraduate. I think it's enough to buy Wenquxing or Easy Link. Other brands such as BBK and Noah's Ark have Longman contemporary, which is enough. But if you want to go further on the road of English learning in the future, then I suggest you buy a celebrity i530.
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By the way, I just thought of some supplementary ideas to communicate with you. I don't know if you have enough money in your hand. Would you like to spend 2000~8000 yuan on a mini laptop? The official name is UMPC, such as Sony P series, Fujitsu LifeBook UH900 series, Fujitsu LifeBook U20 10 series, KOH Jinsha sc 3 kno 6 gcn. These are typical UMPCs with a screen size of about 6 or 7 inches. It's bigger than an ordinary electronic dictionary, but it's small in a notebook and can be carried in a bag. I am thinking of buying one in a year or two, installing dictionary software such as Oxford Advanced, Longman Contemporary, Collins COBUILD Advanced, Macmillan Advanced and Cambridge Advanced (verycd is downloaded as a CD image), and installing Lingus as an electronic dictionary, which perfectly combines portability and functionality.