Pollution is a major threat to the oce.

污染是海洋的主要威胁。

Pollution is a major threat to the oceans.

污染是海洋的主要威胁。

Pollution is a major threat to the environment.

污染是对环境的主要威胁。

Pollution is a major threat to the health of our seas.

污染是对我们海洋健康的主要威胁。

What's the most major threat on the world stage?

世界舞台上最大的威胁是什么？

Desertification has been recognized as a major threat to biodiversity.

土地沙漠化被认为是对生物多样性构成主要的威胁.

Q: Why has diabetes become a major threat to global health?

问：糖尿病为何成为全球健康的重大威胁？

It's a warning that Mattis to regard Moscow as a major threat to the U.S..

这是一个警告，马蒂斯认为莫斯科是美国的主要威胁。

Rogue security software, known as scareware, is also viewed as a major threat.

被称为“scareware”的流氓安全软件，也被视为一大威胁。

Poaching. Poaching is a major threat to the survival of African forest elephants.

偷猎。偷猎对非洲森林象的生存构成重大威胁。