a. has little chance of being the case or coming about
a. 不太可能的
1. It is unlikely that it will rain tomorrow.
明天下雨的可能性不大。
2. She is unlikely to pass the exam without studying.
她如果不学习，考试通过的可能性不大。
3. They are unlikely to arrive on time due to traffic.
由于交通原因，他们按时到达的可能性不大。