第二 (dì èr): Second (numeral) — Meaning & Stroke Order

To save time, he worked late into the night, but ended up getting sick the next day, which was really not worth it.

I found the answer on the second-to-last page.

Africa is the second largest continent in the world.

He is used to preparing the content he will learn the next day in the evening.

Firstly, study hard; secondly, rest well.