When something is arbitrary, someone decided it, but not because of a good reason, a fair rule, or a plan. They just chose. A teacher who punishes one child and not another, with no reason you can see, is being arbitrary — and it feels unfair.

When something is arbitrary當一件事是 arbitrary 的時候，someone decided it是有人決定的，but not because of a good reason, a fair rule, or a plan但不是因為有好理由、公平的規則，或計畫。 They他們 just chose只是選了。 A teacher who punishes one child and not another一個老師處罰一個小孩卻不處罰另一個，with no reason you can see你看不出有什麼理由，is being arbitrary這就是 arbitrary — and it feels unfair而且讓人覺得不公平。

A rule can be arbitrary too: “Why this number? Because I said so.” People also use it in a cooler way.

A rule can be arbitrary too規則也可以是 arbitrary 的：'Why this number?'「為什麼是這個數字？」 'Because I said so.'「因為我說了算。」 People also use it in a cooler way人們也會用比較不帶情緒的方式用這個字。

In maths or science, an “arbitrary number” just means “pick any number; it does not matter which.” That use is not about being mean. Though actually, the older idea is about a judge: if the judge may do whatever they like, the result is arbitrary.

In maths or science在數學或科學裡，an 'arbitrary number''arbitrary number' just means只是指 'pick any number; it does not matter which'「隨便挑一個數字都可以，哪一個都沒差」。 That use is not about being mean這種用法沒有惡意。 Though actually不過其實，the older idea is about a judge比較舊的想法是關於法官：if the judge may do whatever they like如果法官想怎麼判就怎麼判，the result is arbitrary判決結果就是 arbitrary。

Today the complaining sense is the usual one, and the word feels a bit formal. Everyday talk more often says “that’s not fair” or “that’s random,” but random is chance; arbitrary is someone’s choice with no good reason.

Today今天，the complaining sense is the usual one抱怨的那個意思才是常見的用法，and the word feels a bit formal而且這個字聽起來有點正式。 Everyday talk日常講話 more often says更常說 'that's not fair' or 'that's random'「這不公平」或「這很隨機」，but random is chance但 random 是運氣、機率的問題；arbitrary is someone's choice with no good reasonarbitrary 是有人做了選擇，卻沒有好理由。