I'll buy a lottery ticket just in case. But I've never won.

我就会去买一张彩票，碰碰运气。不过我从来没有赢过。

沉迷于彩票的人们 - SpeakingMax英语口语达人

Let's say, the lottery is happening and you want to buy a ticket, and you're not sure.

假设你看到有彩票，你也想去买一张。但是你有点拿不定主意。

The thing is 课堂 - SpeakingMax英语口语达人