英语翻译。如果不是亲眼所见，我是不会相信的。

I will not believe that unless i see it by myself.

a) I will never believe it unless I see it by my own eyes

b) If I cann't see it by my own eyes, then I will never(won't) believe it

c) I must see it by my own eyes, otherwise I will never believe it.

以上三种都表达都可以，若不想太过于表示强调，那么可以用by myself代替by my own eyes)

a) I will never believe it unless I see it by my own eyes

b) If I cann't see it by my own eyes, then I will never(won't) believe it

c) I must see it by my own eyes, otherwise I will never believe it.

If is not personally see, I will not believe of.

I won't believe it unless I see it by myself.

I won't believe it unless I see it by myself.