Mary:Did you enjoy your little sister's concert? Anthony:Are you kidding? Mary:I thought it would be fun to watch the kids dance and sing. Anthony: It was pretty funny. In fact, I could barely keep a straight face. Mary:What do you mean? Anthony: The kids were horrible. Some of them didn't have a bit of talent. Mary:What about your sister? Anthony: Of course she was great. After all, like brother like sister.
straight 是形容詞，表『直的』。一個人遇到令他高興的事時卻拉直了臉不笑，就是 keep a straight face（擺出正經八百的樣子）。此外，我們也常用撲克臉來形容一個人不茍言笑，所以也有另一個類似的用法 keep a poker face（保持一張沒有表情的面容）。
阿雄為人風趣幽默，很愛逗人發笑，最拿手的就是用黃梅調唱英文老歌。
阿珠每每聽到阿雄又拉高了嗓子在耍寶時，都忍不住哈哈大笑，因此她都會這麼對阿雄說：
It's impossible to keep a straight / poker face whenever I see you do funny things.
= I cannot help laughing whenever I see you do funny things.
= I cannot help but laugh whenever I see you do funny things.
（你每次耍寶時，我都很難忍住不笑。）
face 另外有一個有趣的用法：
till one is blue in the face 直到某人臉色發青
阿雄很有自己的想法，所以別人想要說服他可說是難如登天。這天老張又跟他爭論到底先有雞還是先有蛋的問題。阿雄就跟他說： You can argue till you're blue in the face,but I won't change my opinion.
= You can argue as hard as you can, but I won't change my opinion.
= You can argue as possibly as you can, but I won't change my opinion.
（你可以爭論得臉紅脖子粗，但我不會改變我的想法。）
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