The leaves that form a head of cabbage can be purple,red or green.

VOA: special.2009.03.03

Different kinds of polarity form, there's a head, and there's a tail, there's a back, there's a front, there's a left side and there's a right side.

不同的极性开始形成,有头端,也有尾端,有后面,也有前面,有左侧,也有右侧

耶鲁公开课 - 生物医学工程探索课程节选

Adam Rust, head of sixth form at Sirius Academy, said he thought it was the first time a student from Hull had won a scholarship to the public school.

BBC: Refugee student from Afghanistan wins Eton scholarship

The anemic pace of the small business economy is showing its ugly head in the form of minimal improvement in the index.

FORBES: Small Business Economy Continues to Show Weakness

Mr Lang, until last year a head of history in a sixth form college, also wants a greater awareness of world history, looking beyond the United Kingdom and Europe.

BBC: Afghan bombsite