对于这个结构有2个警告：在异常面前不安全；返回值是最后一个方法调用的返回值。
Two caveats apply to this construct: It is not safe in the face of exceptions, and the return value will be the return value of the last function invocation.
三相异步电动机出现异常振动，使设备运行存在着不安全隐患。
The vibration fault of three-phase induction motor makes the equipment run unsafely.
三相异步电动机出现异常振动，使设备运行存在着不安全隐患。
The vibration fault of three-phase induction motor makes the equipment run unsafely.
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