边缘处的针脚已经开始磨损了。

The stitching had begun to fray at the edges.

《柯林斯英汉双解大词典》

比较专业的做法是拆下车轮，用尺子来测量刹车片的最薄处是否已经磨损至允许范围内。

More professional practice is to remove the wheel, use a ruler to measure whether the thinnest of brake pads have wear to allow range.

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密封处已经磨损，机器漏油了。

The seal has worn and the machine is losing oil.

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