The new mattress I bought sags in the middle.
我买的新床垫中间陷了下去。
The top shelf sags because the books are too heavy.
因为过于沉重，书架上的书凹了下来。
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；
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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