adj.极简单的,明白的,一目了然的;
例句:
He's obviously guilty it's an open-and-shut case.
他显然有罪 -- 此案昭然若揭.
He a nervous twitch and began to open and shut his eyes continuously.
他不安地抽动着,并开始不停地眨眼睛.
The murder was an open-and-shut case.
这桩谋杀案很容易侦破。