重点讲解：
1. every now and then
时而；有时；
eg. Every now and then, John Henry would remember the strange dream he had had years before.
约翰·亨利不时地回想起几年前做过的那个奇异的梦。
eg. She comes to visit us every now and then.
她时常来看望我们。
2. stand for
代表，表示；
eg. The five rings on the Olympic flag stand for the five continents.
奥林匹克运动会会旗上的五环代表五大洲。
eg. The letter "x" is often used to stand for an unknown number.
字母x常被用来代表一个未知数。
3. be composed of
组成；构成；
eg. The houses in my hometown were chiefly composed of wood.
我家乡的房子过去多由木料制成。
eg. The university is composed of five academic schools.
整个大学由5个学院组成。
4. be aware of
注意到的；察觉到的；意识到的；
eg. Even students appear to have been aware of the dangers.
甚至连学生们似乎都曾觉察到了危险。
eg. Sometimes we are not consciously aware of these feelings.
有时候我们没有意识到这些情感。
5. be addressed to
寄往；寄给；
eg. The letter was addressed to the occupier of the house.
这封信是写给这所房子的住户的。
eg. I took the liberty of reading the letter, even though it was addressed to you.
尽管这封信是写给你的，但是我冒昧地看过了。
6. be indebted to
感激的；感恩的；
eg. I am deeply indebted to him for his help.
我非常感激他对我的帮助。
eg. He'll always be indebted to you for what you have done.
对于你所做的事情，他会一直感激你。
7. in some ways
（某个）方面；（某）点；
eg. These paintings are in some ways a reminder that earthly pleasures are ephemeral.
这些画在某种意义上提醒人们世俗的享乐是短暂的。
eg. This story reminds me of another movie in some ways.
在某些方面，这个故事让我想起了另一个电影。