While two detectives were keeping guard at the door.
这时两个侦探把住门口。
They are such precious stones that the police are keeping guard at every entrance.
它们是极珍贵的宝石， 所以警察在各个入口严防死守。
The security guard is keeping an eye on the cash in the armored truck.
这位警卫把他的注意力全部放在这辆运钞车上。
Keep on keeping on and do not let down your guard.
继续努力奋斗，千万不要放松警惕。
Keep on keeping on and do not let down your guard.
继续努力奋斗，千万不要放松警惕。
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