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keep guard 守望,警戒
与 stand guard(站岗,放哨)意思相近:Two thieves kept guard around the house while the others entered it.两个小偷在屋子外面守着,其他的则进了屋。
They kept a close guard over the thieves.他们对小偷们严加看管。
to their surprise 令他们吃惊的是
这个短语中的所有格形容词their也可以换成其他所有格形容词:(much) to my/ his surprise, to our surprise 等。一般不说 to your surprise。