经济学人下载:阿富汗 鸦片生意蒸蒸日上

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例句:It's always crowded at peak times.
高峰期总是非常拥挤。 

2.turn to 转向

例句:Tonight it's my turn to cook.
今晚该我做饭了。

3.at least 至少

例句:He's been away for at least a week.
他走了总有一个星期吧。

4.along with 伴随

例句:He came along with some friends.
他和几个朋友一道来的。