Evacuation of vacuum tube
[电] 真空管的抽空法
🧩 词语组成解析
evacuation
[iˌvækju'eiʃən]
n. 撤空;撤离;撤退;疏散;
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
My son must have put you to a lot of trouble.
我儿子一定给你带来不少麻烦。
Are you clear in your own mind what you ought to do.
你自己是否清楚该做什么？
I don't know whether you care to answer right away.
我不知道你是否愿意立即回答。