This is less than the total biological production in the main water column, or pelagic zone.

它比主水体或远洋区的生物总产量要少一些。

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"Whales, on the other hand, often feed at depth," says Roman. "So they feed low in the water column."

“另一方面，鲸鱼通常在深海觅食，”罗曼说：“它们在深水层吃东西，在海面附近排便。”

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Because larger plankton require more nutrients, they have a greater need for the vertical mixing of the water column that restocks depleted nutrients.

由于较大的浮游生物需要更多的养分，为了补充耗尽的养分，它们对于水体中的垂直混合有着更高的需求。

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These companies have proposed putting a stone weighing millions of tons into a tight-fitting water column.

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Local police described how one piece smashed into the ground near Lake Chebarkul, throwing up a column of ice, water and steam and creating a 26-foot crater.

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