短語詞組短語operative time factors 時間因素operative lay over time 生産性停泊時間non -operative lay-time 非生産性停泊時間short operative time 手術時間短operative lay -time 生産性停泊時間shorter operative time 手術時間短longer operative time 手術時間較長shorten operative time 縮短手術時間 返回 operative time