But birds are far less likely to suffer from the clot formation called economy class syndrome-despite being frequent fliers.
但尽管小鸟是空中常客，它们不太可能患上我们容易患上的经济舱综合征。
This is due to a stagnation of blood in the veins caused by prolonged immobility, which can promote blood clot formation in veins.
其原因是由于长时间不动，造成静脉血液停滞，促使静脉中血凝块形成。
The new matrix materials could be used to make the stents less prone to clot formation. The research so far has been conducted with laboratory tissue cultures.
需要新的基质材料制作能减少血凝块生成的支架，但目前的研究仅限于实验室内的组织培养阶段。
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