So Janda and his colleagues added the enzyme to mouse serum, doped with a cigarette's worth of nicotine.

因此简达和他的同事们利用老鼠进行试验，在它们的血清里注射了这种酶，同时还有约一支烟含量的尼古丁。

Cheesemakers usually add an enzyme called rennet, naturally found inside of cows, goats, and some other mammals to help this process along.

奶酪制作者通常会添加一种叫凝乳酶的酶，它自然存在于 牛、羊及其他哺乳动物的体内，来帮助发酵。

And let me show you, I've got one that I'm going to add this enzyme to and one that I'm going to add some water to.

看好了，我要往其中一支加入这种酶，往另外一支加一些水。