「很难说准」英文怎么说？

hit-and-miss (adj.)

(also: hit-or-miss)

Definition:

1. If something is hit-and-miss, you cannot depend on it to be of good quality, on time, accurate, etc.

2. Done in a way that is not planned or organized. 

1. 时好时坏的；没准的；碰运气的

2. 无计划的；无组织的；误打误撞的

a hit-and-miss affair 

(结合上下文以后)可翻译为：

没准的事情

或

欠缺周详计划的行动

Farming can be very much a hit-and-miss affair. 

农业这个东西嘛，没准的。

The trains are often late, so getting to work on time is a hit-and-miss affair. 

火车经常误点，所以要准时上班确实是件碰运气的事。

We are working on a rather hit-and-miss basis at the moment. 

我们现在就是误打误撞碰运气，没有什么具体计划的。

The weather in Vancouver is really hit-and-miss. It can be sunny and rainy in the same day. 

温哥华的天气变幻莫测，阳光明媚的一天竟然也可以下大雨的。

A: Do you like your new teacher? 

B: He's really hit-and-miss. Sometimes we have great classes where we learn a lot, and other days we just sit and talk about our weekend. 

A: 你喜欢你的新老师吗？

B: 他没准的，有时候在他课堂上气氛很好同时也可以学到很多东西，有时候呢，我们就只是坐在那里跟他聊聊我们的周末过得怎么样。

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