重点讲解：
1. a bunch of
一伙，一群（人）；
eg. We don't want to look like a bunch of cowboys.
我们不想看上去像一帮奸商。
eg. They're just a bunch of leeches cadging off others!
他们只不过是一帮伸手向人要这要那的寄生虫！
2. go on
进行；发生；
eg. Are you alive to what is going on?
你注意到正在发生的事吗?；
eg. In spite of these events, things will go on as usual, and there will be no changes at all.
尽管发生了这两件事，一切都将照常进行，不会有任何改变。
3. on one's feet
站立；站着；
eg. Everyone was on their feet applauding wildly.
每个人都站起身来热烈鼓掌。
eg. The old man could hardly stand on his feet in the flaw.
老人在这阵狂风中几乎站不住了。
4. fall down
倒下；跌倒；
eg. He fell down by a ditch.
他跌倒在沟旁。
eg. Babies often fall down when they learn to walk.
婴儿在学走路时经常摔倒。
