目的对胸外伤后肺不张发生的原因进行探讨。
Objective To probe into the pathogenesis of atelectasis after chest trauma.
他们在城市公共广场张贴了一张每天发生的事情的清单。
They posted a list of daily happenings at public squares in the cities.
当我回到家的时候，我发现了妈妈留下的一张纸条，上面写着：“爸爸发生了意外。请到公园医院来见我们。”
When I came home, I found a note from my mother that said, "Dad has had an accident. Please meet us at the Park Hospital."
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