...ot;Good air" days are those when the daily concentration of PM2.5-airborne particles of 2.5 microns in diameter or smaller that are harmful to health-is below 75 micrograms per cubic meter, while "severely polluted" is higher than 150 mcg per cum这句when the daily concentration of P...
...一书的介绍中这样写Every time that we write or speak, we are faced with a myriad of choices: not only choices in what we say but in how we say it.请问这里的是否出现错误了，我觉得应当是：choices not only in what we say but in how we say it.
...plainly that, so far from his imagining that there was anything ridiculous or funny about his story, he regarded it as a really important matter, and admired its two heroes as men of transcendent genius in _finesse_.1) he never changed his voice from the gentle-flowing key to which he tuned hi...
...e slightly more or less of a particular quality. 【搭配模式】：with neg Sometimes, that standard is quite difficult, if not impossible, to achieve...有时即便有可能达到那个标准，那也是非常困难。 I'm working on my fitness and I will be ready in a couple ...
...ndings are a great start. But the study was small and needs to be repeated
with far larger groups of people to determine exactly which aspects of an
exercise routine make the biggest difference. 翻译：美国心脏协会发言人尼卡·戈德伯格博士说，莱文的发现是一个很好的开...
请问专家：问题一：I don't have much background in order or anything.这里的in order or anything怎么理解呢？问题二：sounds interesting为何没有it作主语也可以单独用，而且是写成sounds而不是sound？（备注：现在网站暂时无法充值鲜花，等系统...
It is natural for person like her, with her personal sufferings as an insignificant daughter-in-law in a big feudalistic family这个with引导的是什么成分，我只见过it is for sb to do 的结构，这个没看懂。这是不是个错误的句子。
...句的将来时态用得不妥：
Either you’ll leave this house or I’ll call the police. 你要是不离开这座房子，我就叫警察来。
应该改为一般现在时吧。即：
Either you leave this house or I’ll call the police. 你要是不离开这座房子，我...
...谢！ Go it alone. Even though you might feel more comfortable going with a friend or partner, the office hour will go better if it’s just you and the professor. You’ll get in more questions, the discussion will be tailored to what you need most help on, and two-party communication is almo...
John received an invitation to dinner，and with his work ________，he gladly accepted it.A．finished B．finishingC．having finished E. having been finished答案A，没有问题。(with sth done结构）我的问题是：B，C和E是否可以？由于finish 既可以用作vt, 又可以用...
...rage rate, they argue, shippers who have the option of switching to trucks or other forms of transportation would do so.替代词do so可以替代动+宾+状的整个谓语部分，那么这句话里为什么so只替代了switching to trucks or….这部分呢？我的理解是do so替代整个谓...