Pre-op
abbr. preoperation 空转, 试运转; preoperational 试运转的
🧩 词语组成解析
abbr. 炼油工程师（Petroleum Refining Engineer）
观测所\\n[计] 操作, 运算, 算符
🗣️ 情景例句
I've thought about that for some time.
我已经想过一阵子了。
Who is the auther of this mystery story?
谁是这篇神秘故事的作者？
I had traced the cause of the trouble.
因为我找到了毛病所在。