The use of high-power density laser beam to weld many alloys often leads to appreciable changes in the composition and properties of the weld metal.

高功率激光焊接合金材料时，常常导致焊缝合金元素的损失，从而影响焊缝的组织和性能。

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You revise the composition of the basket regularly to introduce new goods and eliminate obsolete ones, and to respond to changes in the composition of spending.

你定期调整篮子里面东西的构成，增加新产品，去掉过时的产品，根据消费构成的变化而变化。

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You revise the composition of the basket regularly to introduce new goods and eliminate obsolete ones, and to respond to changes in the composition of spending.

你定期调整篮子里面东西的构成，增加新产品，去掉过时的产品，根据消费构成的变化而变化。

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