They put their backs into the work and finished it in half an hour.
他们全力以赴地干，半小时就完成了这项工作。
Put infants to sleep on their backs.
保持婴儿仰卧睡姿。
We put our backs into the work and finished it in half an hour.
我们全力以赴，半个小时就做完了工作。
We put our backs into the work and finished it in half an hour.
我们全力以赴，半个小时就做完了工作。
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