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adj. /ˌhɪt.ənˈmɪs/
If something is hit-and-miss, you cannot depend on it to be of good quality, on time, accurate, etc.
没准的,碰运气的
The trains are often late, so getting to work on time is a fairly hit-and-miss affair.
火车经常晚点,所以准时上班在很大程度上是件碰运气的事。
I'm really sorry, my internet connection has been a bit hitand miss today.
对不起,我的互联网连接今天有点时好时坏。