Toilet. Many public toilets in cities have toilets installed. And this toilet is very "simple", there is no toilet seat or anything like that. In some countries, toilets are equipped with a disposable paper ring. So when you go to the toilet, you only need to pull out the paper ring and cover it on the toilet seat. On the one hand, it can ensure cleanliness. On the other hand, the paper ring is also soluble in water and can be flushed directly. Some public toilets in China have not yet done this, so when you use the toilet, you will inevitably leave urine stains, which makes it smelly.