他们可以把牙刷头掰掉，几秒钟内把牙刷柄磨尖。

They can break the brush head off and sharpen the shaft in seconds.

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汽蚀可使阀内件的表面产生磨痕、深沟及凹坑。

Cavitation can make the surface trim have worn, and deep pits.

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汽蚀可使阀内件的表面产生磨痕、深沟及凹坑。

Cavitation can make the surface trim have worn, and deep pits.

youdao