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1.knock down 击倒
He manages to knock down a guard and grab a knife.
他设法击倒了一个警卫，抓起了一把刀。
2.charged with 肩负……的职责
The governing body is charged with managing the school within its budget.
学校管理机构负有在预算范围内管理好学校的职责。
3.trail off 声音越来越小
Cabell let his words trail off when he realized that no one was listening to him.
卡贝尔意识到没有人在听他说话，便把嗓音拉低了些。
v. 伸展，展开，传播，散布，铺开，涂撒
n.
