1、The human head can contain up to several hundred thousand hairs, with a maximum of about 500, 000.
人類頭上的頭發(fā)約有幾十萬根，最多可達(dá)50萬。

2、The human head can contain up to several hundred thousand hairs, with a maximum of about 500,000.
人類頭上的頭發(fā)約有幾十萬根，最多可達(dá)50萬。

3、Contagious: a human head louse clings to a strand of hair.
感染力：附著在一根頭發(fā)上的人類頭虱。