A transmission shaft is driven by a flat key.

传动轴用平键传动。

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The inner part of a shaft end hole of the backstop is connected with a driven shaft through an expansion bush and a double flat key;

在逆止器的轴端孔内通过胀套和双平键与从 动轴连接；

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We'll be in the key of E-flat.

用降E调

耶鲁公开课 - 聆听音乐课程节选

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