Upgrading hydrocarbon
[化] 改质烃
🧩 词语组成解析
v. 升级；提高品位（upgrade的现在分词）
🗣️ 情景例句
Good-bye.
再见。
Fashion is a very popular magazine in America.
《时尚》是美国很流行的杂志。
The examination put a lot of stress on him.
那次考试给了他很大的压力。