that's the number that leave in the urine.

也就是留在尿中的分子数量
That's not true for glucose.

对于葡萄糖则非如此
I mentioned yesterday that glucose is not normally found in urine.

我昨天说过葡萄糖在尿中一般是找不到的
When you do find glucose in the urine of an individual

当你真的在某人的尿中找到葡萄糖时
that indicates that there's some disease process going on

那也就意味着这人正患有某种疾病
and that's because glucose is very efficiently reabsorbed

因为在近曲小管中葡萄糖
in the proximal tubule.

重吸收的效率很高
If I just looked at concentration within the filtrate,

如果只是观察流经近曲小管的滤液
within the urine through the proximal tubule,

或者原尿中的葡萄糖浓度
there'd be a lot of glucose here and that concentration drops

会发现有很多葡萄糖而浓度随着
as we move through the proximal tubule

原尿在近曲小管中前进会不断下降
such that there's no glucose in the filtrate

因此当走到近曲小管末端时