U. S. policy makers will have to hope one of its chief economic rivals steps in to pick up the slack.

美国的决策者将不得不寄希望于其经济上的主要竞争对手之一能够介入，填补其退出造成的空缺。

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As the older model's sales fizzle, so the younger one can take up the slack.

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If you slack off in one year, you can make up for it the next year.

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But, one more time, my sister had to pick up the slack and make all the arrangements while I traveled back.

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