While effective, warfarin is incredibly tricky for doctors to use because there is only a tiny margin between giving too little and giving too much, risking uncontrolled bleeding.

• 虽然有效，杀鼠灵，是令人难以置信的绝招供医生使用，因为只是一个小小的保证金之间给予太少，并给予太多了，几乎陷入失控的出血。