Mutability is the fact that something can change, or often does change. You use it for the changing-ness of a thing: the weather, a mood, a plan, even a number in a computer program.

Mutability is the factmutability指的是一個事實：that something can change某個東西可以改變， or often does change或是常常在改變。You use it你會用這個字 for the changing-ness of a thing講一個東西「會變」這件事：the weather天氣、a mood心情、a plan計畫、even a number in a computer program甚至是電腦程式裡的一個數字。

It is a noun, so the usual shape is “the mutability of X.” It sounds a little formal; in everyday talk people more often say “it can change” or “it keeps changing.” You will meet it a lot in science and in computer work: if a value has mutability, you are allowed to rewrite it; if it does not, it must stay as it is.

It is a noun它是名詞， so the usual shape is the mutability of X所以常見的用法是「the mutability of X」。It sounds a little formal聽起來有點正式；in everyday talk日常說話時 people more often say it can change大家比較常說「它可以變」 or it keeps changing或「它一直在變」。You will meet it a lot你會常常遇到這個字 in science and in computer work在科學和電腦領域裡：if a value has mutability如果一個值有mutability， you are allowed to rewrite it你就可以改寫它；if it does not如果沒有， it must stay as it is它就必須保持原樣。

Though actually, writers also use it for people and for fashion — “the mutability of taste” means what we like will not sit still.

Though actually不過其實， writers also use it作家也會用這個字 for people and for fashion講人，或講流行時尚 —— the mutability of taste「the mutability of taste」這個說法 means意思是 what we like will not sit still我們喜歡的東西不會一直不變。

The opposite idea is immutability: no changing allowed.

The opposite idea相反的概念 is immutability是immutability：no changing allowed不准改變。