My uncle has two dogs. One is big and the other is small. —
我的叔叔有两只狗。一只是大的，另一只是小的。 —

He likes them very much.
他非常喜欢它们。

One day, Mr. Smith came to visit him. —
有一天，史密斯先生来看他。 —

When the friend saw two holes in the door, a large hole and a small hole, he was surprised and said, “My dear friend, why are there two holes in your door? ”—
当朋友看到门上有两个洞，一个大洞和一个小洞时，他感到惊讶并问道：“我亲爱的朋友，为什么你的门上有两个洞？”

“Let my dogs come in and come out, of course,” Mr. Smith asked. —
“当然是为了让我的狗进出，”我的叔叔回答。 —

“But why are there two holes? One is enough! ” —
“但为什么有两个洞？一个就够了！” —

“But how can the big dog go through the small hole?” —
“可是大狗怎么能穿过小洞呢？” —

my uncle said.
我的叔叔说。

Sometimes a clever man may make such mistakes.
有时候聪明人也会犯这样的错误。