我怎么就变成了个噪音检查员了？
研究者称，一项发明能消除牙钻在使用时所发出的噪音，而这能帮助人们克服对牙科检查的恐惧。
An invention which cancels out the noise of a dentist's drill could help people overcome their fear of a check-up, researchers say.
如有明显行驶噪音，检查发动机轴承和旋转部件。
Check engine bearings and rotating parts if there is significant driving noise.
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