white cells

例句：

1. 1. The doctor said that the patient needed to have a bone marrow transplant.
   医生说病人需要做骨髓移植。
2. 2. White cells are responsible for fighting off infections.
   白细胞负责抵抗感染。
3. 3.The white cells in his blood were abnormally high.
   他血液中的白细胞异常高。