同学你好，该知识点来自沪江网校《Hitalk口语【外教1V1】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好，
这三个词很多时候可以互换，possibility和probability为是否发生或是否真实， （但同学有没有觉得probability比possibility发音拗口一些？）,likelihood只是是否发生。统计学中常用probability, 如probability distribution一般指概率分布，这时候是固定的专业名词，不能用其他词替换。

https://dictionary.cambridge.org/dictionary/english-chinese-simplified/possibility
a chance that something may happen or be true
可能（性）
It's not likely to happen but I wouldn't rule out the possibility.
这件事不太可能发生，但我不会排除有这种可能性。
something that you can choose to do in a particular situation
可选择的方法；可能的情况
We could take on extra staff - that's one possibility.
我们可以再招一些人——这是一种选择。

https://dictionary.cambridge.org/dictionary/english-chinese-simplified/probability
the level of possibility of something happening or being true
可能性
What is the probability of winning?
获胜的可能性有多大？

https://dictionary.cambridge.org/dictionary/english-chinese-simplified/likelihood
the chance that something will happen
可能，可能性
This latest dispute greatly increases the likelihood of a strike.
最近的这场冲突极大地增加了罢工的可能性。

祝好！