indeed 回复：学习一下

来源: 于 2011-12-09 00:12:22 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

lily3: Thank you!! This age-related explanation is very helpful!

When my kids were little, I bought a picture book from their preschool weekly booklist titled "First there must be love" and that pretty much solved the problem (they learned where babies come from etc.)