This method is safe, economical and easy to adopt with conventional heat treating equipment. Applied to some dies and easily worn-off parts, it can prolong their service life to a great extent.

应用此法于模具和某些易磨损机件上可较大地提高机件的使用寿命，且方法本身安全、经济，在一般的热处理设备条件下即能进行。

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And she added: "A mask can be worn continuously for up to eight to 10 hours, but must be replaced if it is taken off at any stage.

她补充说：“一只口罩持续佩戴可以达8-10个小时，但是期间一旦摘下就必须更换。”

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He pulled off a light overcoat that he had worn, and put it round her tenderly.

他把身上穿的一件薄薄的外衣脱下来，轻轻地披在她的身上。

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The most beautiful pieces however are the window pane jackets and the patch elbow double-breasted sport coat worn over cut-off shorts.

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Greenfield believes the novelty of 3-D has worn off and viewers are tired of paying more for movies that are inevitably darker.

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It said people were abandoning them because they could not afford to keep them, their status effect had worn off and over-breeding had lessened their financial value.

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