You never know how clean the toilet actually is.

远不知道厕所的清洁程度如何。

And as world economies grow and populations rise, shipping's emissions are expected to soar, unless the industry charts a cleaner course.

随着世界经济和人口增长，如果运输行业不找个清洁的方法，排放就注定会激增。

Lower calories or fat doesn't mean lower sugar, doesn't mean a cleaner ingredients list.

低卡路里或脂肪并不意味着低糖，也不意味着更清洁的表。

I don't know what the window washing situation is.

我不清楚窗户清洁的现状如何。

Ah, non. Absolument. And chefs don't do the cleaning anyway.

绝不 不管怎样 厨师是不做清洁工作的。