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
She looks neat and fresh.
她看起来优雅清新。
How often did I tell you to keep quiet?
我告诉你多少次要安静?
No, I haven't. Why? Have you?
没有，我没有。怎么啦？你有吗？