Not on the plan — happening when no timetable said it would. This is the word for the extra stop, the sudden meeting, the landing nobody arranged: an unscheduled stop, an unscheduled visit, an unscheduled press conference. It belongs to the world of timetables and official plans, so you meet it most around planes, trains, hospitals, factories and politics. A plane makes an unscheduled landing; a factory has unscheduled downtime; a president makes an unscheduled trip to the border.

Not on the plan不在計畫裡 — happening when no timetable said it would發生在時刻表上沒有寫的時候。 This is the word for the extra stop, the sudden meeting, the landing nobody arranged這個字就是用來講那種多出來的停靠、臨時的會議、沒人安排的降落: an unscheduled stop, an unscheduled visit, an unscheduled press conference像 an unscheduled stop（臨時停靠）、an unscheduled visit（臨時拜訪）、an unscheduled press conference（臨時記者會）。 It belongs to the world of timetables and official plans它屬於時刻表和官方計畫的世界, so you meet it most around planes, trains, hospitals, factories and politics所以最常在飛機、火車、醫院、工廠和政治相關的場合看到它。 A plane makes an unscheduled landing飛機臨時降落; a factory has unscheduled downtime工廠有計畫外的停工; a president makes an unscheduled trip to the border總統臨時前往邊境訪問。

Two things to feel. First, it says nothing about whose fault it is or whether it is good or bad — an unscheduled holiday could be lovely, unscheduled maintenance is expensive. It only reports that the plan did not contain this.

Two things to feel有兩點值得體會。 First, it says nothing about whose fault it is or whether it is good or bad第一，它完全沒有說這是誰的錯，也沒說是好是壞 — an unscheduled holiday could be lovely臨時放的假可能很棒, unscheduled maintenance is expensive而計畫外的維修則很花錢。 It only reports that the plan did not contain this它只是在陳述一個事實：這件事不在原本的計畫裡。

Second, it carries a faintly official tone, the voice of the announcement rather than the person affected. The airline says "an unscheduled landing"; the passenger says "we had to land early." Almost always used in front of a noun. You would rarely write "the meeting was unscheduled" — more natural is "the meeting wasn't on the schedule."

Second, it carries a faintly official tone第二，它帶有一點淡淡的官方語氣, the voice of the announcement rather than the person affected是廣播宣布的口吻，而不是受影響的人自己的說法。 The airline says "an unscheduled landing"航空公司會說「an unscheduled landing」（臨時降落）; the passenger says "we had to land early."乘客則會說「we had to land early.」（我們得提早降落） Almost always used in front of a noun這個字幾乎都是放在名詞前面用。 You would rarely write "the meeting was unscheduled"很少人會寫「the meeting was unscheduled」 — more natural is "the meeting wasn't on the schedule."比較自然的說法是「the meeting wasn't on the schedule.」