一些国家在外汇储备中省下收益，而不是将其花在进口上。

Some save the proceeds in foreign-currency reserves, rather than spending them on imports.

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贸易顺差给中国带来了稳定的外汇出口收益，给中国央行提供了收购资金以交换本币并维持官方储备。

The trade surplus pours a steady stream of foreign-currency export earnings into China, funds the central bank buys up in exchange for local currency and holds in its official reserves.

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美国可以发行世界储备货币，但其债市经不住收益率的突然上升。这反过来还会威胁到摇摇欲坠的经济复苏。

America may be the issuer of the world's reserve currency, but its debt markets are not immune to a sudden upward lurch, which in turn could threaten the fragile recovery.

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