GbEng
他来时,我正巧忙着写信。 It happened/chanced that I was busy writing a letter when he came.
在一个雨夜,那个警察正巧碰上了一伙走私犯。 One rainy night the policeman had a chance encounter with a gang of smugglers.
我正巧路过,所以我想不妨进来坐几分钟。 I was just passing, so I thought I'd blow in for a few minutes.