从发达国家到发展中国家的反向流动也在增加。

The reverse flow, from developed to developing countries, is on the rise, too.

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用于液压系统中防止油流反向流动。

For the hydraulic system to prevent reverse flow of oil flow.

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用于液压系统中防止油流反向流动。

For the hydraulic system to prevent reverse flow of oil flow.

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