第二和第三用英语表达分别是："second"和"third"。

"Second"一词来源于拉丁语"secundus"，意思是"次要的，其次的"。"Third"一词来源于拉丁语"tertius"，意思是"第三的"。

以下是一些使用"second"和"third"的例句：

She finished the race in second place.

I'm going to the store for the second time today.

Can you give me a second chance?

He is my second cousin.

The second book in the series is even better than the first.

She came in third place in the spelling bee.

This is my third day working on this project.

The third time's the charm.

He is the third member of the team.

The third chapter of the book is about the history of the city.