VOA慢速英语:特朗普提名马蒂斯担任美国国防部长

短语讲解：

1. At the time, he led the U.S. Central Command, which carries out U.S. operations in the Middle East.

carry out 进行; 执行; 完成
例句：The Social Democrats could still carry out their threat to leave the government
社会民主党人仍有可能将其退出政府的威胁付诸实施。

2. Michael O’Hanlon writes about military affairs at the Brookings Institution, a research group in Washington.

write about 写…的事，写到…
例句：what the critics are going to write about your show yet.
评论家们会对你的展览写些什么。