英语语法分析

Which three sieves?

哪三个筛子？

“Normally, our memories are like sieves, ” he says.

“通常，我们的记忆就像是个筛子，”他说。

"Three sieves? Which three sieves?" the man asked with puzzlement.

“三个筛子？哪三个筛子？”那人不解的问。