Composition of petroleum
[建] 石油的成份
🧩 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'll give him your message as soon as he's available.
他一有空我就转告他您的留言。
When the fire started, I was writing letters.
当火起来的时候，我在写信。
we all rushed to see it.
我们都赶紧跑去观看。