1.U C 可能性，可能发生的事　the likelihood, chance that sth will or did happen
2.C 概率　the chance of an event happening, expressed as a calculation based on known numbers

　The probability that it will rain today is high.　今天下雨的可能性很大。
There is a 50% probability that the population will be infected with the disease.民众感染这种疾病的概率为50%。

 ♣ in all probability
十之八九，很可能almost certainly
　In all probability she will arrive in time for dinner.　她十有八九会按时来吃饭的。