不过，目前他们的面积和出现次数都在上升：目前发现的死水区域已经有超过400个。

But they are increasing in both size and number: dead zones have now been reported in more than 400 areas.

youdao

对大面积“死水区域”来说化肥残留物是罪魁祸首，在墨西哥湾，氧气耗尽的死水区域几乎没有海洋生物生存。

Fertilizer runoff is responsible for a vast "dead zone," an oxygen-depleted region where little or no sea life can exist, in the Gulf of Mexico.

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当流量在一定范围内变化时，主流区下方均有漩涡低速区或死水区，该区域的大小与流量有关，其位置基本不变。

There is a whirlpool or dead zone below the main water flow zone when the flow changes and the size of which is related to flow but its location basically unchanged.

youdao

当流量在一定范围内变化时，主流区下方均有漩涡低速区或死水区，该区域的大小与流量有关，其位置基本不变。

There is a whirlpool or dead zone below the main water flow zone when the flow changes and the size of which is related to flow but its location basically unchanged.

youdao