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Because the vertical pressure gradients within the blood vessels are counteracted by similar pressure gradients in the surrounding water, the distribution of blood throughout the body of sea snakes remains about the same regardless of their orientation in space, provided they remain in the ocean.
OG的一篇阅读,句意读是明白了。NN能不能解释一下provided they remain in the ocean 在句子里的成分。不明白为什么要用they。如果要用they感觉provided和they应该不是一句话存在的。如果一句话,应该用them宾格吧。但是往前找provided的主语,也没发现 。 |
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