Secretary of defense
n. 国防部长\\n
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
Next time, bring the baby.
下次把小宝宝一起带来。
I ought to go right away.
我应该立刻去。
He had been obliged to join the army during the Second World War.
年龄比他两个弟弟大很多，第二次世界大战期间被迫参军。