1.as of 到……时候为止
As of 1860, there were about four million slaves in the United States.
截至1860年,美国大约有四百万的奴隶
。2.lift off 起飞
The heavy bombers slowly lifted off.
重型轰炸机慢慢地起飞了
。3.departure 离开
His sudden departure threw the office into chaos.
他的突然离去使这个部门陷入一片混乱
。4.intercept 拦截
Reporters intercepted him as he tried to leave the hotel.
他正要离开旅馆,记者们把他拦截住了
。5.thwart 挫败
The security forces were doing all they could to thwart terrorists.
安全部队正尽其所能挫败恐怖分子
。