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。