Also I find old notebooks , because the paper is old , dusted and yellowed .

另外那些旧的笔记本，纸都旧了，好多尘土，发黄了。

The yellowed lens allows less blue light into the retina . And those wavelengths of light play a key role in regulating our circadian rhythm and sleep schedule .

变黄的晶状体很难将蓝色光波带入视网膜，而那些光的波长在调节我们的昼夜节律和睡眠规律中起着至关重要的作用。