You use whichever in order to indicate that it does not matter which of the possible alternatives happens or is chosen.
例句
Whichever way you look at it, nuclear power is the energy of the future...不管从哪个角度来看，核能都是未来的能源。Israel offers automatic citizenship to all Jews who want it, whatever colour they are and whichever language they speak.犹太人只要愿意，均可自动加入以色列国籍，不管他们是什么肤色，不管他们说何种语言。
DET
(用来指明多个可能性中正确或特指的一个)…的那个
You use whichever to specify which of a number of possibilities is the right one or the one you mean.
例句
...learning to relax by whichever method suits you best.学会用最适合的方式来放松自己
英汉词典释义
pron.
…的那个人[事物]
Choose whichever of them you like best.选一个你最喜欢的吧。
无论哪个[哪些]
Whichever of them are you going to help?你究竟帮助他们当中的哪一个?
adj.
(究竟)哪个, 哪些
Whichever book do you like?你到底喜欢哪一本书?Whichever day you come, we will be pleased to see you.无论你哪一天来, 我们都很高兴。