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
OK. Finish off by jogging in place.
好 ，结束之前在原地慢跑。
No matter what comes up, don't sound nervous.
不论发生什么事情，你也不要显得紧张。
I can't have been.
我不会开得那么快的。