while .,it is therefore ..如何理解这个句型

Strike the iron while it is hot 是it is worth while还是it is worthwhile对? Strike the iron while it is hot.3Q It is not co______to take too much luggage while traveling while .,it is therefore ..如何理解这个句型 Life is an onion and one cries while peeling it. rats squeak while flies buzz,it is quite a house.其中it is quite a Something is a knot when you reserve it while it's a scar when opened. While his love is now a memory,it is also a real dream that never ends To do something is one thing while to do it well is quite anonther.怎样翻译 翻译Emotion is changing,while reality is always there,it never changes. Emotion is changing,while reality is always there,it never changes. the cork is being pulled out while screw is being drilled into it什么意思 It has taken while It while online shopping is an important part of today‘s society.句子结构分析为何要有it while?it的作用是什么？ 英语翻译Out of these scattered pieces came a hierarchic classification of orders of message and (therefore) of orders of learning,the beginnings of a theory of schizophrenia and with it an attempt,very premature.这个句子怎样翻译?(theref 英语翻译IntroductionThe objective of this chapter is to review the open literature on molecularsieve zeolite synthesis,highlighting information regarding the fundamentalmechanisms of zeolite crystallization in hydrothermal systems.The text,theref It is worth while reading the book.It would be worth his while helping the foreigner.为什么用would为什么一句加would,另一句不加?