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.
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.
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.
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.
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