blood vessels are distended
血管扩张
以上为机器翻译结果，长、整句建议使用 人工翻译 。
That is especially true in the heat, when blood vessels in the legs are distended and blood tends to pool in the feet, making the flow of blood up to the head even more difficult.
在高温下这更明显，因为腿部血管膨胀大量血液流向足部，使得向头部输送血液变得更难。
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