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warn against告诫, 当心, 提防
例句：He warned me against pickpockets.
他让我提防小偷。
The doctor warned the patient against smoking.
医生告诫病人不要吸烟。
2.The whistle-blowing website Wikileaks says it's instructing lawyers to oppose an American court subpoena ordering the Internet messaging network Twitter to disclose personal information about the Wikileaks founder Julian Assange and four associates.
这句话的主语和谓语是：The whistle-blowing website Wikileaks says，后面是宾语从句，说的具体内容。it's instructing lawyers to oppose an American court subpoena是宾语从句的主干。ordering the Internet messaging network是现在分词作后置定语，修饰subpoena，说明该传票的具体内容。
3.The kidnappers sped off in the direction of the lawless desert region along the frontier with Mali.
speed off加速离开
例句：When the re－ception is over，the newlywed run to their"decorated"car and speed off．
当招待会结束的时候，这对新人奔向他们装饰一新的汽车然后驱车离去。
4.The attacks, thought to be by South Korean hackers, seem timed to coincide with the younger Kim's birthday.
coincide with与…一致
例句：My holiday coincides with John's.
我和约翰同时放假。
My suggestion coincides with your opinion.
我的提议正和你的意见相合。
