But in 2017 the improvement in PM 2.5 concentrations stopped and the level flattened out.This winter has seen welcome episodes of clear skies but also more days than in 2016 of the worse,choking smog,when daily PM 2.5 levels rise above 300.The annual average level remains about 25...
...n overboard by the crews on the rigs.
1.这句话为什么可以省略food和thrown 之间的was，后置定语修饰前面的名词可以不要was的吗，动名词和不要be动词的光过去分词都可以这样用的吗，只是一个主动和被动
2. the plentiful （supply of ）food throw...
...虚拟语气。那能不能说这样说呢？If he finished his homework at that time, he would play computer games.类似的：She had left, before he arrived. (这里的before里的从句能不能理解我代替了过去将来时？）
Our work hopes to promote a new design system in which a user has the option to choose an attractive robotic prosthesis and to feel comfortable to wear it in a public place. 请问这里为什么不用feel comfortable wearing, 不是一般觉得feel comfortable to do不正确吗？比如I feel comfo...
I'd prefer it if you didn't smoke in front of me.老师，可以改成以下这些句子吗？1. I'd prefer this if you didn't smoke in front of me.2. I'd prefer that if you didn't smoke in front of me.3. If you didn't smoke in front of me, I'd prefer it.4. If yo...
It was important only in that the adaptations of the creatures living in the words could tell me something about the tower.这里的 in 是怎么来的？我把 in 去掉，It was important only that …… 这样似乎也说得通？that 是关系代词么？引导什么从句...
Probably there is no one here who has not in the course of the day had occasion to set in motion a complex train of reasoning, of the very same kind, though differing in degree, as that which a scientific man goes through in tracing the causes of natural phenomena.请问这句话该如何分析...