When you hit the nail on the head,exactly on its top, it goes into the wood perfectly.

VOA: special.2009.09.20

Then again you can change this pattern to turn it on its head

同样的，你也可以倒过来，

I will 课堂 - SpeakingMax英语口语达人

This newly discovered iguana has a pink head with black stripes on its body.

VOA: special.2009.12.16