Q: What's the difference between a monkey and a flea?
問題：猴子和跳蚤的區別是什么？
A: A monkey can have fleas, but a flea can't have monkeys.
答案：猴子可以有跳蚤，跳蚤卻不能在猴子身上。

1.between…and…
問題是問兩者之間有什么區別，所以用between…and。
如果是問三者及三者以上，一般要用among這個單詞了。
今天就重點來說說between…and…
(1)連接兩者,表示在…之間，如：
I’ll phone you between lunch and three o'clock. 我將在午餐后三點鐘以前給你打電話。
He felt something between laughter and anger. 他既覺得好笑，又感到氣憤。

(2) 由于……和……(表示原因)。如：
Between the noise outside and lack of sleep, he couldn't concentrate. 由于外面的噪音加上睡眠不足，他無法專心。
注：between...and 不僅可連接兩者，也可連接三者。如：
Luxemburg lies between France, Germany and Belgium. 盧森堡位于法國、德國和比利時之間。
Between cooking, writing and running the farm he was kept very busy. 他又是做飯，又是寫作，還要打理農場，忙得不可開交。

(3) 用于習語：between ourselves [you and me] 僅你我知道的秘密。如：
Between ourselves, I don’t think he will live much longer. 咱們私下說說，他活不久了。
Between you and me, he’s not very reliable. 這是只有你我之間才說，他不是很可靠。

2.flea
作名詞跳蚤，蚤目的昆蟲；生蚤的動物
復數：fleas
flea market：跳蚤市場。