英语语法分析

Methods: Measuring the content of citrulline in cell cultures by HPLC.

方法：用HPLC检测细胞培养中瓜氨酸是否存在及其量的大小。

Remember to eat the rind, since this is where most of the citrulline is found.

记得一定要吃瓜皮，因为大部分瓜氨酸都在瓜皮里。

Watermelons: Watermelons are a rich source of citrulline, an amino acid that can be made into arginine, which then gets converted to nitric oxide.

西瓜：西瓜里富含瓜氨酸，这是一种可以转化为精氨酸的氨基酸，而精氨酸又可以变成一氧化氮。