C196 The Difference Between the Day and the Night Is Huge

Bai Ling believed she was diligent in her cleaning, yet she couldn't recall exactly how many years had passed since the last time she did. Pondering this, she said:

"The old man instructed me to sweep the wooden house (grave) every spring and autumn, so I've kept to his wishes. But for some reason, I can't seem to get it as pristine as it was when he was still with us