We need protein. You cannot live without protein.

我们需要蛋白质，没有蛋白质你就不能生存。

youdao

Nowadays, some people cannot live without mobile phones for even one hour, becoming slaves of mobile phones.

如今，有些人甚至离开手机一小时都不行，成为了手机的奴隶。

youdao

Man cannot live without air.

人离开了空气不能生存。

《新英汉大辞典》

He noted that Bong and Lofa counties produce the most rice, and he added, "We cannot live without rice."

VOA: special.2009.01.27

Electron transfer, we cannot live, we die without sodium chloride.

电子转移了，没有氯化钠我们不能生存。

麻省理工公开课 - 固态化学导论课程节选

International Herald Tribune: Especially for American expats who cannot live without The New York Times crossword.

BBC: Living in: Paris

So companies that cannot live without their files have to arrange a backup for safekeeping.

FORBES: Serendigity

Second, should you find something you absolutely cannot live without, do not make the mistake of deciding you will pop back for it later.

BBC: Saturday at Bangkok��s Chatuchak market