地势从南向北逐步降低。

The terrain slopes downward from the south to the north.

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银行正逐步降低风险，并拥有了更多的储备。

Banks are taking less risk and are holding bigger reserves.

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这项限制条令迅速覆盖了全世界，逐步降低了大气中的危险物质。

The restrictions quickly capped and then began steadily reducing atmospheric concentrations of those dangerous chemicals.

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