重点讲解：
1. on one's own
单独地；独自地；
eg. I need some time on my own.
我需要独处一段时间。
eg. For many old people living on their own the telephone is their lifeline to the outside world.
对许多独居的老年人来讲，电话是他们与外界联系的生命线。
2. push through
通过；穿过；
eg. The doctor pushed through the crowd to get to the injured man.
医生挤过人群来到受伤的男子面前。
eg. The hole is too small; I cannot push my arm through.
这个洞太小了，我的胳膊伸不过去。
3. because of
因为；由于；
eg. Many beautiful fish are fast disappearing because of the severe pollution.
因为污染严重，许多美丽的鱼类正在面临绝种。
eg. He got angry with me because of my remark.
他由于我讲的话而生我的气。