Gather and tie the leaves over the head, and do not wait for the buds to separate before harvesting.

VOA: special.2010.03.09

He spent his entire career at Yale and he wrote-- He was Head of our social sciences department, before we had separate departments of economics and psychology, etc.

他将毕生奉献给了耶鲁,而且他写了...,他是社会科学系的主任,社会科学系是,经济学系与心理学系等系的前身

耶鲁公开课 - 金融市场课程节选

For example,in nineteen eighty-seven, he led a team of seventy doctors and nurses in an operation to separate two babies joined at the head.

VOA: special.2009.09.04

On Friday,in a separate development, police in Kosovo arrested the head of the country's central bank.

VOA: special.2010.07.24