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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With warm, buoyant water on top and cold, dense water below, the water column doesn't mix easily.

上层水温暖而浓度小，下层水寒冷而浓度大，因此水体难以混合。

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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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Instead of remaining concentrated at the surface, dispersed oil pollutes the entire water column.

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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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"We will aspire to sample the water column everyday, " he told BBC News.

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