Grade of oil
[经] 石油品级
🧩 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];
oil
[ɔɪl]
n. 油;石油;油画;燃油;
vt. 给…加油;
vi. 化成油;
🗣️ 情景例句
I've been busy all day.
我今天一整天都非常忙。
There's TV coverage of the NBA tournament.
有个NBA联赛的电视报道。
For years we've been demanding better housing and jobs.
多年来我们一直要求改善住房和工作条件。