The states set the eligibility criteria and in many cases have not kept up with changes in the composition of the workforce.

各州设立符合条件的标准，许多方面已跟不上工种的变化。

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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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The thin ozone layer has proved to be an Achilles heel that may be seriously injured by apparently moderate changes in the composition of the atmosphere.

薄臭氧层已被证明是一个通过大气明显中等变化，会被严重伤害的要害。

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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