Today's arithmetic lesson is on the addition of proper fractions. Please insert yesterday's homework in the proper slot."on是比较正的学术类的关于，the addition of proper fractions是真分数的加法的意思吗？proper还有这个用法呢吗？
So for a company in this situation, keeping up to date with the latest technology, even if it's only for the benefit of key staff, this can be hugely expensive.
请问老师，keeping up to date with the latest technology是什么成分
But in addition, as a chapter on substitute foods shows, although these substitutes may have been developed to help us escape the tyranny of sugars and fats, they are not without their own risks.句中as a chapter on substitute foods shows起什么作用，是什么成分，可以详细说明一下...
...略is吗?The country has （been/gone) through a drastic reduction in its birth rate _______ facing labor f shortage. 请问下老师：has been through 和 has gone through是不是都可以用？
后半句直接facing开始可以吗？还需要加is吗？
...看这句话的翻译和句子结构：Once the actor ceases to be the dominant element in production, having no longer to 'make a speech', he recedes into the background to take his place among his co-workers, the various other poetic-musical devices, ready to follow the convolutions result...
Apart
from the hostile influence of man, the organic and inorganic world are, as I
have remarked, bound together by such mutual relations and adaptations as
secure, if not the absolute permanence and equilibrium of both, a long
continuance of the established conditions of each at any given time and ...
.... % She apparently liked it
more than what we did. (% 表示 grammatical in some dialect(s) only)该书认为：句1.是正确句。句2：是不规范句。但在与网友交流时我发现对句2究竟哪里不规范，有不同理解。因此，我觉得有必要进一步探讨，以便把这...
Oil rigs have to be repaired frequently and divers, who often have to work in darkness a hundred feet under water, have been frightened out of their wits by giant fish bumping into them as they work.1. by giant fish bumping into them as they work中，bumping into them是fish的定语，bumping into...
...pensive shoes to look fashionable. And a lot of other people wear shoes so that their feet won’t stink（发臭）up the room.这道题目考查文章结构，第45题答案是C（三个原因→归总结果），但看实际文本，显然与C并不符合。该段是先提出问题，然后给出...
... focus upon。1.动词用法(1) focus为不及物动词Focus
on/upon the main problem. 把注意力集中于主要的问题上。He
prefers to focus on/upon the positive. 他更愿意关注积极面。The
study narrowly focuses on 30-year-old men. 这项研究仅局限于30
岁男性。We
need to fo...
关于according to与according as用法的区别一般书是这样说的：according to是介词，后接名词或代词；according as是连词，后接句子。但有时也可以看到according to后接句子的用法啊！比如：
Adjectives can be classified according to where they occur i...
Nearly every great building in Beijing was built ______ south.(A) to face(B) facing(C) to have faced(D) being facing答案是 B，按照《赖氏经典英语语法》里面的语法规则，was built face 的话，就有两个谓语动词了，所以第二个 face 就要变成非谓语；又由于...
...语法174页：关于should表示假设意义的其他用法：I am sorry that he should have been overlooked (=has been / was overlooked)章振邦的意思是也可以使用has been或was overlooked 而意思不变。他还说：should + 不定式进行体 = 表示现在时间；should + 不定式...
At last they went to the dining-car. Two rows of Negro waiters, in glowing white suits, surveyed their entrance with the interest, and also the equanimity (平静), of men who had been forewarned. 这是以前没有看懂的一个句子，不知道把 of men 接到哪里，entrance? 感觉也不...