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
I'll do it.
我去。
I leave the office at 7.
我七点离开办公室。
but as a special favour, he would let me have it for $30.
作为特别优惠，他愿意让我出30英镑成交。