Some ideas are more believable than others.

　　一些觀點相較其他觀點會更為可信。

　　This is both understandable and believable.

　　這既可理解，又可相信。

　　It's not believable that we come from chimpazees.

　　我們從黑猩猩進(jìn)化而來不令人信服。