英语翻译Oceanographers have identified more than 50 "dead zones"

英语翻译
Oceanographers have identified more than 50 "dead zones" around the world:areas of sea that various forms of pollution have rendered indistinguishable from life.
重点是最后rendered indistinguishable from life要怎样翻译.
正确答案连起来后就是这样。而且答案和老师对过，一定是对的。字也没打错。