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这句话是什么意思啊?请从语法角度来分析翻译watermaytakedecadestocirculateinthese3-Dgyresinthetopkilometreoftheocean,andcenturiesinthedeeperwater

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这句话是什么意思啊?请从语法角度来分析翻译
water may take decades to circulate in these 3-D gyres in the top kilometre of the ocean,and centuries in the deeper water
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water may take decades to circulate in these 3-D gyres in the top kilometre of the ocean,and centuries in the deeper water
take some time to do sth花一些时间做某事
翻译:海洋上层几千米的水需要几十年才才完全循环过来(绕完这些三维环流),而深层海水需要几百年才能完成这一过程.