血

例句：

1. 1. The doctor told me to stay awayfrom the source of infection.
   医生告诉我远离感染源。
2. 2. The ancient city is rich inhistory and culture, with many relicsleft behind by its ancestors.
   这个古城历史文化底蕴丰厚，留下了许多祖先的遗迹。
3. 3.Blood transfusions are essential for savinglives during emergencies.
   在紧急情况下，输血是挽救生命的关键。