This creates a chisel-like effect referred to as “edge-loading” that produces large volumes of microscopic metallic particles that can cause havoc in some patients.

这就形成了所谓的“关节边缘应力集中”（edge-loading）的凿状效果，从而产生大量的金属微粒，令患者苦不堪言。

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ZZM-A drill grinder simple structure, easy operation. One setup to complete grindings on drill web and chisel edge.

a型钻头磨刀机结构简单，使用方便，一次装夹就可以完成钻头的钻尖和横刃的修磨。

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A pick, especially with one end of the head pointed and the other end with a chisel edge for cutting through roots.

鹤嘴锄，丁字镐一种鹤嘴锄，尤指一头尖而另一头有可割断根的凿边。

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Once that was done, he set to the real work: with hand drills, handsaws (their teeth rubbed, to run more smoothly, with a candle end), his bevelled-edge chisel and his wide, heavy, trusty Number 7 plane, which he used for everything.

ECONOMIST: Alan Peters