Harry glanced at the clock beside his bed. it was five minutes to eight o'clock. His stomach made a strange rumbling noise. He turned over in bed and cuddled his cat Fredd “Freddy, I’m starving, “he ...

大家或许都知道 exchange 是交换的意思，但是在口语中我们更常用单词 swap 来表示“交换”之意。这两个词兼有名词和动词的词性，作为名词，exchange 不仅有我们交换的意思，也可以用来指人与人之间短暂的交流。然而 swap，它专指同等事物的交换，是一个比较 ...