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重点讲解：
1. know of 听说过；略有耳闻；
I know of him, but I can't really say that I know him.
我只是听说过他，但是我不能说我认识他。
2. all over 到处；遍及；
We have friends all over the world.
我们的朋友遍天下。
3. tell apart 区分；区别；辨别；
Free range and battery eggs, boiled for four minutes, were hard to tell apart.
柴鸡蛋和笼养鸡蛋在煮过4分钟之后很难区分。
4. be vulnerable to 易受伤害的；易受影响的；
Tourists are more vulnerable to attack, because they do not know which areas of the city to avoid.
游客们最容易受到袭击，因为他们不知道应该不去城市里哪些地区。
n. 范围，行列，射程，山脉，一系列
v. 排
