重點(diǎn)講解：
1. a series of
一連串；一系列；連續(xù)；接連；
eg. A series of mischance happened.
一連串不幸的事發(fā)生了。
eg. The student always asks his teacher a series of questions.
這個學(xué)生總是問他老師一連串的問題。
2. serve to do
用作；充作；
eg. Their brief visit has served to underline the deep differences between the two countries.
他們短暫的訪問恰恰凸顯了兩國間分歧的嚴(yán)重程度。
eg. A single example will serve to illustrate the point.
只舉一個例子就可以把問題說清楚了。
3. range between
（在一定幅度內(nèi)）變化，變動；
eg. Prices range between 7 and 10.
售價在7英鎊和10英鎊之間。
eg. The temperature ranges between 30 and 40 degrees centigrade.
溫度在攝氏三十度與四十度之間。