is proportional to concentration

与浓度的一次幂或者说是成
to the first-power or linear with concentration.

线性比例关系的
As drug concentration goes down,

随着药物浓度下降
since k is a constant for any particular drug.

k就是任何特定药物的常数
It's one number, as the concentration

只是个数字就像浓度从2毫克每公升
drops from two milligrams per liter to one milligram per liter,

下降到1毫克每公升
the rate that your body eliminates it goes down by half as well.

等于你身体排除药物的速率下降到一半
I like to think about this

我认为这就像
as you could think about concentration as money in your wallet,

你思考你的口袋里的钱的数量
and the rate at which I spend money anyway

那个速率就是我把钱用了哪些后
is proportional to the amount that I have in my wallet;

口袋里剩余的钱是成比例的
when I have more I spend more,

我有越多钱时就花得越多