The new mattress I bought sags in the middle.

我买的新床垫中间陷了下去。

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Most Chinese giant oilfields are distributed in the sags rich in oil and gas.

中国的大油田主要分布在富油气凹陷中；

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Most Chinese giant oilfields are distributed in the sags rich in oil and gas.

中国的大油田主要分布在富油气凹陷中；

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