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1.The metal notch on the edge of the knife is sharp enough to cut through paper.
刀柄边缘的金属缺口足够锋利，可以切断纸张。
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2. The engineer carefully measured the metal notch in the machine before adjusting the settings.
工程师在调整机器设置前仔细测量了机器上的金属缺口。
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3.The construction worker used a metal notch to remove the old paint from the wooden beams.
建筑工人使用金属缺口将旧油漆从木梁上清除。