crack

　　n. 裂缝,缝隙;爆裂声,破裂声　vt. 使发出爆裂声;使破裂,使爆裂　vi. 发出爆裂声

　　常用短语

　　crack up v.撞坏,健康崩溃,吹捧

　　fatigue crack 疲劳裂缝，疲劳裂纹

　　toe crack 焊缝边缘裂纹，焊趾裂纹

　　crack down 劈啪的一声击下

　　sand crack n. 马之裂蹄症

　　crack of doom 世界末日的霹雳

　　quarter crack 【医】 马蹄裂

　　参考例句

　　Any pitcher is liable to crack during a tight game.任何一个投手在紧张的比赛中都可能会失常。

　　Wedge packing into this crack.把填料塞入这裂缝中。

　　The mirror went crack.镜子啪地裂了。

　　cracked up on the expressway.在高速公路上撞车了

　　Oil is seeping out through a crack in the tank.油箱的裂缝漏出油来了.

　　contract

　　vt. 收缩;使缩短,感染,订约,承包,缔结 ; n. 合约,婚约,契约,起诉书 vi. 订约,承包

　　参考例句

　　A penalty clause was written into the contract.在合同中写入了一项罚款条款.

　　A fiduciary heir; a fiduciary contract.受托继承人;信托合同

　　renew a contract;renew a magazine subscription.准予合同展期;续订杂志

　　The steel mill contracted for ten million tons of iron ore.炼钢厂立约订购1000万吨铁矿。

　　We ask for modification to the contract.我们要求对合同做修改。