Reader's Digest看到这样一句话：Where at first all that was demanded of him in school was a sign, now Matthew's teachers wanted a sign plus a vocalization of the word the sign represented.请问老师，此处的where 该怎么理解？是第一句中主语从句的一部分吗？
UV-H2O2
photo-oxidation technology was only available for the advanced treatment of
low-turbidity water with a critical limitation of 6 NTU turbidity. H2O2光氧化技术适用于低浊度水的深度处理，降解效果以浊度6 NTU为分界点。请问老师这里的critical怎么理解？
It is not who is right but what is right that is of importance.这是强调句吧？还原成普通句子（非强调句）应该是如下句子吗？还有没有更好的还原方法？总觉得不对头。Who is right is not important but what is right is of importance.
老师好!A good book may be among the best of friends. It is the same today that it always was, and it will never change. It is the most patient and cheerful of companions. It does not turn its back upon us in times of adversity or distress. It always receives us with the same kindness; amusing and...
...ed up from friends. Then I phoned the Gestapo Headquarters. I had a couple of suitcases full of my dispatches, broadcasts and notes that I wanted to take out of the country, I said. As I was flying off early the next day, there would be no time for Gestapo officials at the airfield to go over the co...
VOA 《US Approves Emergency Use of Vaccine》In the case of health care workers you can find them in health care settings, so and in the case of long-term care residents that certainly they're in long-term care facilities,so it may not mean as much for the first two priority groups., but once you s...
...。这句话不太理解：
No, I wanted to do something that had more of a proper structure to it, I suppose. 句中的 more of a proper structure 是什么意思？to it 中的it是指什么？整句话应该怎么理解？谢谢！
The American medical school is now well along in the second century of its history.be along 是正处在...的意思吗？along在这是介词吗？in the second century of its history意思是在他的历史的第二个世纪里？
Ritual is defined by sociologists as "that part of family life that the family likes abiout itself, is proud of, and wants formally to continue."请问第一个"that"和"formally"是什么意思？
...y are getting enough shut-eye,but in a major sleep study almost 80 percent of respondents admitted to not getting their prescribed amount of nightly rest. 请问老师这个句子成分如何划分，句子开头为何会有think /are getting两个谓语动词呢？ 还有一个问题，两个gettin...
I caught sight of the criminal in the hotel where i stayed.强调宾语：It was the criminal that I caught sight of in the hotel where i stayed.I bought the book I like.强调宾语：It was the book I like that I bought.这样是没错的吧？
None would have dreamed of there being such a place.此句中，there being 是否为there be结构？如果是，of 后边是否可以接：there is such a place(省略了先行词that)？如果可以这样接，是否所有宾语从句都可以变为这种动名词形式？