关于 if desired 的用法在柯林斯词典查到以下用法说明：PHRASE 短语（用于说明性的书面语中）如果需要的话,如果愿意的话 If desired is used in instructions in written English to indicate that someone can choose to take the course of action mentioned. Additional ...
While we'll learn a lot with the great instruments we have aboard the
rover, it may very well require the
far more well-equipped laboratories and delicate instruments back here on Earth
to tell us whether our samples carry
evidence that Mars once harbored life.
请问老师们，这句话中it作...
Economy
is one powerful motive for camping, since after the initial outlay upon
equipment, or through hiring it, the total expense can be far less than the
cost of hotels.请问为什么两个
since after 连在一起用啊？
皇家赌场里有一句I need you looking fabulous请问need后接人之后可以1.need sb do 2.need sb to do3.need sb doing都可以吗？PS：need不加人的用法是need do 情态动词，只在否定句和疑问句need to do 实意动词need doing表被动对么?
...ace that is visually evident on the stage.请问老师这个非谓语动词的主语是acoustical scenery吗？我可以理解为：Soundscapes may be made to create acoustical scenery, （acoustical scenery shapes shaping） the perception of space that is visually evident on the stage.acoustical s...
mankind 前面好像通常是不用冠词的，也不用复数。如：Mankind are intelligent animals. 人是理智的动物。Language is peculiar to mankind. 语言是人类特有的。Sympathy is the feeling characteristic of mankind. 同情心是人类特有的情感。He has devoted his whole ...