国务卿是美国国务院的负责人。

The ___Secretary of State is the head of the U.S. Department of State.

国土安全部部长监督国内安全措施。

The ___Secretary of Homeland Security oversees domestic security measures.

前美国国务卿科林·鲍威尔是一位备受尊敬的外交官。

Former U.S. ___Secretary of State Colin Powell was a highly respected diplomat.