last: adjective usually meaning 'final'

last：形容词，通常表示“最后的、最终的”

Examples:

例句：

I took the last train to Memphis.

This is the last test of the semester!

我搭上了去孟菲斯的最后一班火车。

这是这个学期最后一门考试了。

latest: adjective meaning 'most recent' or 'new'

latest：形容词，表示“最近的、最新的”

Examples:

例句：

His latest book is excellent.

Have you seen his latest painting?

他最新一本书非常精彩。

你看到他最新的画作了吗？