阿瓦斯汀最严重的副作用（这些副作用有时可以导致死亡）有胃肠穿孔，伤口愈合并发症，出血和血块形成。
The most serious side effects associated with Avastin, in some cases resulting in death, are gastrointestinal perforation, wound healing complications, hemorrhage, and blood clots.
它们虽可以减轻病痛，但会抑制一种防止危险的血块在动脉形成的混合物的生长。
They relieve pain, but hamper a compound that helps prevent dangerous blood clots from forming in the arteries.
有一个血块，可能在腿部形成，顺血管向上流动，最后停留在肺部，造成了心脏停跳。
A blood clot, possibly formed in the leg, had moved upward and lodged in the lung, causing cardiac arrest.
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