2. Words with the word "extension" in the middle: business development, bow your head and spread your wings, open up territory, open up territory, forge ahead, and so on.
3. The last words of the word "extension": railway development, stele extension, imitation extension, extension, extension and so on.
Extended data:
The word group (1) usually refers to a single Chinese character combined with other suitable Chinese characters to form a two-syllable or multi-syllable word, which is often used as one of the contents of Chinese practice in primary schools. But we should pay attention to names, places and proper nouns. You can't combine words.
(2) Extended words refer to the needed phrases obtained by matching extended words with other suitable Chinese characters to express their meanings.
(3) the extension of the original meaning of the text: the development and expansion of tuo; Such as: pioneering.
References:
Baidu Encyclopedia-Group Words