Efficiency of boiler
[机] 锅炉效率
🧩 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
I know you are.
我知道你是。
Saying and doing are two things.
说与做是两回事。
Oh? What happened?
哦？发生什么事了？