youdao

youdao

The name stems from the waveform's appearance on a scope; it looks like the teeth of a hand saw.

锯齿波的名字来源于示波器上其波形的形状，它看上去就像是手锯的齿一样。

youdao

With the ball in his hand and the bit between his teeth, he had a point to prove.

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Among other encouragements, he writes of improving days, how is hand feels stronger when brushing his teeth and when gripping his steering wheel.

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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