Now again, if you don't go to the States, you think, I don't need to know these expressions, but if you watch Hollywood movies and they're using american english, they're going to use a lot of these expressions.
現在再說一遍,如果你不去美國,你會認為,我不需要知道這些表達方式,但如果你看好萊塢電影,他們使用的是美式英語,他們會使用很多這些表達方式。