可持续性不仅仅是一种趋势，更是我们对后代的责任。

Everyone is in favor of free speech. Hardly a day passes without its being extolled， but some people's idea of it is that they are free to say what they like， but if anyone else says anything back， that is an outrage.

The protection of fishery resources is not a multiple-choice question, but a required question.