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翻译The more carbon the steel contains and the quicker the cooling is, the harder it becomes.

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翻译Because of its high strength and hardness this grade of steel may be used for tools and working parts of machines.

翻译But for some special uses, for examples, for gears, bearings, springs, shafts and wire, carbon steels cannot be always used because they have no properties needed for these parts.

如果你得到两张免费的奥运会参观券，它们可以看作是自由取用物。

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清代服饰坚守本民族旧制，不轻易改变原有服式。一改汉人的宽衣大袖而是窄袖筒身，代替汉族的绸带，衣襟用（）系扣。官服采纳明代的（）表示官阶，直接绣方形或圆形于衣上，这样的衣服被称作（）。