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
but I don't want to put it off too long.
但我希望不要拖得太久。
Generally speaking, it's cheaper but slower to ship goods by sea than by rail.
总的来说，海运比铁路运输更便宜，但速度慢一些。
The glasses keep their eyes safe.
眼镜可以使眼睛不受伤害。