Then, for two weeks, the roosters lived in constant dim light.

然后，让公鸡持续在微弱的光线中度过两个星期。

Right now, the only way to measure circadian rhythm is to keep people in a dark room, or at least constant dim light, and measure melatonin.

目前，测量昼夜节律的唯一方法是让人们呆在黑暗的房间里，或者至少保持恒定的昏暗光线，然后测量褪黑激素。