a second又一，再一

[例句1] He offered me a second drink which l refused.

他请我再喝一杯，我没有接受。

[例句2] You can try a second time.你可以再试试。

the second第二

[例句1] Saturn is the second biggest planet in the solar system.

士星是太阳系中的第二大行星。

[例句2] A new chapter is included in the second edition.

这本书再版时插入了新的一章。