还有一次，就在五个月前的一个傍晚，我碰巧在楼上，窗户是开着的。

Another time five months ago, I happened to be upstairs at dusk when the window was open.

youdao

还有一次，就在五个月前的一天黄昏，本人碰巧在楼上，窗户是开着的。

Another time five months ago, I happened to do upstairs at dusk when the window was open.

youdao

还有一次，就在几个月以前的一个晚上，我碰巧在楼上，窗户是开着的。

Another time some months ago, I happened to be upstairs one evening when the window was open.

youdao