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
Don't be lazy, the older you get, the harder it will be to learn.
别偷懒，年纪越大，学起来就越难。
You use the front door and I'll hit the back.
你从正门进去，我袭击后面。
Hello, Jim! How are you?
吉姆，你好吗？