unpredictable
- adj. 不可预知的；不定的；出乎意料的
- n. 不可预言的事
考试真题
- Its informal conversational style would make interaction comfortable, and yet the machine would remain slightly unpredictable and therefore interesting.
出自-2013年6月听力原文
- Biologist Jill Farrant of the University of Cape Town in South Africa says that nature has plenty of answers for people who want to grow crops in places with unpredictable rainfall.
2018年6月六级真题（第一套）阅读 Section B
- Ever since humanity began to farm our own food, we've faced the unpredictable rain that is both friend and enemy.
2018年6月六级真题（第一套）阅读 Section B