Foreign Minister 是负责外交事务的外交部长,是世界上绝大多数国家使用的称呼。
Foreign Secretary 是负责英国外交部的大臣(在君主立宪制国家各部负责人称为大臣),中文译为“外交大臣”,仅仅使用于英国。
例如:
The British Foreign Secretary will visit Middle East countries.英国外交大臣将访问中东地区。
The Foreign Secretary is the Minister in charge of the United Kingdom's Foreign and Commonwealth Office. In many countries this job is called Foreign minister.