Perfective maintenance
[计] 完善性维护
🧩 词语组成解析
a. 完成的, 完成时的\\nn. 完成时
🗣️ 情景例句
This is a good deal: buy 1, get 1 free.
这可是个好买卖：买一送一。
We're all anxious to hear Mr. Jones'remarks.
我们都很急切地想倾听琼斯先生的讲话。
Can you imagine how much he paid for that car?
你能想象他买那车花了多少钱吗？