如果它们再叮咬另外一个人，便把病菌注入他的血流。采采蝇就是用这种方法传播引起非洲嗜睡病的细小生物体。

• "If they bite another person, they inject the disease germs into his blood stream. In the same way, the tsetse fly transmits the, tiny organism that causes african sleeping sickness."