来自《耶鲁大学开放课程：生物医学工程探索第17集第17集》

you only have to produce about 1 L or 1.5 L of urine per day

你每天才只需产生一升至一升半的尿量
to get rid of all the waste products

来清除身体通过新陈代谢
that are produced by metabolism in your body.

而产生的废物
Without that concentrating ability of your kidney,

假如缺少了肾的浓缩功能
I mean the ability of the kidney to produce a urine

我是指肾能够将代谢废物浓缩
that's very concentrated in waste rather than dilute in waste,

而不是稀释
you only have to relief yourselves of 1.5 L of fluid everyday

从而让你每天只需排出一升半的液体
instead of the 100 or so liters that you'd have to

不然的话在缺少浓缩功能的情况下
in the absence of that ability to concentrate.

你每天需要排出大约一百升才能满足需求
That makes possible a lot of the things that we enjoy in life

这让我们能够享受生活的种种乐趣
like sitting through a 50 minute lecture.

比如我们能坐上五十分钟来听一堂课
What I want to talk about today is

今天我要讲的是