She began to vomit blooda few days before she died.
她在去世前几天开始吐血。
《柯林斯英汉双解大词典》
2
If your heart is deprived of adequate amounts of blood, a heart attack can occur.
如果你的心脏被剥夺了过多的血液，就可能会引起心脏病发作。
3
Their accomplishments include artificial blood, a biological sensor to detect arsenic and bacteria that can act as "living computers" to solve mathematical problems in lab dishes.