hit-and-miss

剑桥词典

If something is hit-and-miss, you cannot depend on it to be of good quality , on time , accurate , etc.
沒準的，碰運氣的
The trains are often late, so getting to work on time is a fairly hit-and-miss affair . 火車經常晚點，所以準時上班在很大程度上是件碰運氣的事。 返回 hit-and-miss