She indicated the black rats, who promptly started skipping again.

她指指那些黑耗子，它们马上又开始蹦跳起来。

The insects hitched rides on the black rats that flourished along trade routes, aiding the spread of the plague.

跳蚤寄生于在贸易线上繁衍生息的黑鼠身上，助长了瘟疫的传播。

One big black rat carefully crawled over to the doctor.

一只黑色的大老鼠小心翼翼地爬到医生身边。

A study has found that cutting down trees in rainforests appears to be accelerating the spread of black rats. Here's our Science correspondent Matt Mcgrath.

一份研究发现，砍掉热带雨林的树木似乎能加剧黑鼠的蔓延，科学记者马特·麦格拉斯报道。

He would have liked to put six big black rats in the room with her and lock the door but he didn't have six big black rats.

他很想把六只大黑鼠和她一起放在房间里，然后锁上门，但是他没有六只大黑鼠。