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1.search for 寻找
例句:They drew a blank in their search for the driver.
他们四处寻找那个司机，但一无所获。
2.polar bears 北极熊
例句:For the first time they're finding polar bears that have actually drowned.
人们首次发现了淹死的北极熊。
3.common features 共同特征
例句:What are some common features of their work?
他们工作的一些共同特征是什么？
4.fell into 掉进
例句:Totally exhausted, he tore his clothes off and fell into bed.
他疲惫至极，扯下衣服，一头倒在床上。
