逆流交换系统(heat countercurrent exchange system）肢体末端的动脉与静脉紧邻以维持体热不散失的一种血管构造 也指鸟类呼吸时气体流动方向（鸟类呼吸时气体总是从后面的气囊过肺到前面的气囊）与血液流动方向相反，以加强气体交换的效率
棱皮龟通过将鳍状肢底部的血管排列成逆流交换系统来完成这一过程。
The leatherback accomplishes this by arranging the blood vessels in the base of its flipper into a countercurrent exchange system.
当然并不只是棱皮龟有这种结构，海鸥的腿部也有一个逆流交换系统。
The leatherback is certainly not the only animal with such an arrangement; gulls have a countercurrent exchange in their legs.
刚孵出的小海龟太小了，即使有保温和逆流交换系统，也无法保持体温。
Hatchlings are simply too small to conserve body heat, even with insulation and countercurrent exchange systems.
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