He checked into a top London clinic yesterday for an operation on his knee.
他昨天住进了伦敦一家最高级的诊所，准备做膝部手术。
Do not perform the undo checkout operation on a unit that is not checked out.
不要在一个没有检出的单元上执行取消检出操作。
Do not perform the check-in operation on a unit that is checked in.
不要在检入的单元上执行检入操作。
Use checked exceptions to report errors that may occur, however rarely, under normal program operation.
使用需检查异常来报告可能发生但是在正常程序操作中很难发生的错误。
Encouraged by Master Meng, I checked on the machine's operation record.
在孟师傅的鼓励下，我查看了一下机器的操作记录。
Encouraged by Master Meng, I checked on the machine's operation record.
在孟师傅的鼓励下，我查看了一下机器的操作记录。
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