易混淆的单词： Grinding

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Grinding is generally not recommended .

我们一般不建议研磨。

The grinding room was empty .

那间研磨室里空无一物。

He was grinding against my crotch and I gasped .

他对我的裤裆磨，我倒抽了一口冷气。

Grinding profile graph of turbine blade .

涡轮叶片磨削轮廓示意图。

Grinding wheel is not balanced , should change or mend it .

砂轮不平衡，应更换或用粗砂轮片修理。