explain
英 [ɪkˈspleɪn]   美 [ɪkˈspleɪn]  
v.
解释;说明;阐明;说明(…的)原因;解释(…的)理由

例句

First, I'll explain the rules of the game.

首先我要说明一下游戏规则。

She tried to explain but he wouldn't listen.

她试图说明一下原因，可他根本不听。

scientific findings that help explain the origins of the universe

有助于解释宇宙起源的科学发现