If something is done arbitrarily, it is decided or arranged without a real reason or a fair plan — often it feels unfair, as if someone just picked. A rule applied arbitrarily, a teacher who arbitrarily gives extra work: the point is “not following a clear, shared reason.” This is the adverb from arbitrary — it tells you how the deciding was done, not what the thing is.

If something is done arbitrarily如果一件事arbitrarily地被做，it is decided or arranged without a real reason or a fair plan表示決定或安排時沒有真正的理由或公平的規劃——often it feels unfair常常讓人覺得不公平，as if someone just picked好像有人隨便挑一個一樣。 A rule applied arbitrarily一條arbitrarily被套用的規定，a teacher who arbitrarily gives extra work一個arbitrarily出額外作業的老師：the point is "not following a clear, shared reason."重點是「沒有依照清楚、大家都能認同的理由」。This is the adverb from arbitrary這是arbitrary的副詞形式——it tells you how the deciding was done告訴你決定是怎麼做出來的，not what the thing is而不是那個東西是什麼。

In careful talk it can also mean “in any way you like / picked at random,” without the angry sense of unfairness; maths and science use it more calmly (pick a number arbitrarily). In school English, the unfair reading is the one students meet first.

In careful talk在比較講究的用法裡，it can also mean "in any way you like / picked at random,"也可以指「隨便選、隨機挑」，without the angry sense of unfairness不帶不公平的怒氣；maths and science use it more calmly數學和科學用得比較平靜，(pick a number arbitrarily)像pick a number arbitrarily隨意選一個數字。 In school English在學校英文裡，the unfair reading is the one students meet first學生最先接觸到的是不公平這個意思。