英语博客-北美风情 157、Heads up!

　　This week we’re looking at expressions used for sharing information with people when you are trying to help them out. We talk about which expressions are casual¹, which are formal, and which can be used in different situations. All of the expressions are used often, so listen here and learn how to use them correctly.

　　Maura:  So if we say that I gave my friend a heads up about the test, it means that I told her about the test, or I warned her about the test, before it happened so that she could prepare and be ready for the test.
Harp:  Exactly. And the possible origin for this expression comes from baseball.
Maura:  Like so many American expressions.
Harp:  Exactly. So at a baseball game, when someone yells² heads up, it’s because a ball is coming towards you. So you put your head up to see the ball so you can move out of the way and so it doesn’t hit you.
Maura:  Right. So if you think about it, when that person yells, heads up they’re giving you a warning that the ball is coming.
Harp:  Exactly.

1 casual   

adj.漠不关心，冷漠的；随便的，非正式的；偶然的，碰巧的

参考例句：

• He earns a living by casual labour.他靠做临时工为生。
• The guests wore casual clothes.客人们穿着便服。

2 yells   

v.叫喊，号叫，叫着说( yell的第三人称单数 )

参考例句：

• The most savage yells of all came from the schoolchildren. 最野蛮的喊叫声来自那些学童。 来自英汉文学
• Dimes, dimes, "yells another, selling $ 10 vials of crack. 另一个卖瓶装克拉克的青年也在大声叫卖。 来自名作英译部分