研究者认为，每年生活在热带的人每数百万中就有数十人感染登革热病毒。

Researchers think that tens of millions of people in the tropics become infected with the dengue virus each year.

youdao

研究者认为，每年生活在热带的人每数百万中就有数十人感染登革热病毒。

Researchers think that tens of millions of people in the tropics become infected with the dengue virus each year.

youdao