重點講解：
1. know of 聽說過；略有耳聞；
I know of him, but I can't really say that I know him.
我只是聽說過他，但是我不能說我認識他;|b;00pguR)blZ@t。
2. all over 到處；遍及；
We have friends all over the world.
我們的朋友遍天下_TTF]d0),rK,Ma=I。
3. tell apart 區分；區別；辨別；
Free range and battery eggs, boiled for four minutes, were hard to tell apart.
柴雞蛋和籠養雞蛋在煮過4分鐘之后很難區分_Swi(![X_bDUF。
4. be vulnerable to 易受傷害的；易受影響的；
Tourists are more vulnerable to attack, because they do not know which areas of the city to avoid.
游客們最容易受到襲擊，因為他們不知道應該不去城市里哪些地區Nf@08=j|+KH。