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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Changes in the composition and structure of the workforce are not the only catalysts for altering the relationship between unemployment and inflation.

ECONOMIST: The great American jobs machine

But the investigation finds no changes in the composition of the sediments that would indicate a significant dip in temperatures in East Africa concurrent with the Toba eruption.

BBC: Toba super-volcano catastrophe idea 'dismissed'

The United States will consider changes in the composition, policies, and actions of the Government of Syria in determining whether to continue or terminate this national emergency in the future.

WHITEHOUSE: The White House