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- 若时机不当，一言不慎，可能毁掉整个计画。
One indiscreet remark at the wrong moment could ruin the whole plan.
- 你做的方法不当。
You're doing it the wrong way.
- 我一看到她的反应就意识到我说话不当。
I realized that I had said the wrong thing when I saw her reaction.
- 由于使用不当，机床失去控制。
The machine tool went out of control because of improper use.
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