Agriculture had taken over most of the fertile river valleys that the species depends on, and the survivors were under relentless assault by trophy hunters and poachers.

当时，农业土地侵占了它们赖以生存的肥沃河谷，而且幸存的犀牛还遭到猎手和偷猎者的无情捕杀。

youdao

Thanks to the President's relentless military assault, many fighters from both groups have fled across the borders.

由于alvaro Uribe持续不断地发动军事突击，两支游击队的很多战士已经逃离边境。

youdao

Its assault on humans has been relentless, especially among African children.

CNN: Researchers say they found malaria's origin: In chimps