如果人们拥有的太少或太多导致了环境的恶化，我们就不得不思考到底多少才算足够。

If environmental destruction results when people have either too little or too much, we are left to wonder how much is enough.

youdao

面对白纸一张，你就不得不思考一切。

If you start with nothing, you're forced to think about everything.

youdao

你不得不思考跟这个更大世界之间的关系。

You have to rethink your relationship to the larger world.

youdao

Pretty clearly, to think about death and continued existence and survival, we have to get clear about the nature of personal identity.

很清楚，要想思考死亡,和继续存在并且活着，我们不得不弄清楚个人身份的本质。

耶鲁公开课 - 死亡课程节选