Absent-mindedness is the habit, or the state, of forgetting things because your thoughts are elsewhere.

Absent-mindedness is心不在焉的意思是 the habit, or the state, of forgetting things忘東忘西的一種習慣或狀態 because your thoughts are elsewhere因為你的心思飄到別的地方去了

It is the noun: not “he is absent-minded,” but “his absent-mindedness made him miss the stop.” People treat it as a small human failing, often linked with being busy or living in your head.

It is the noun它是名詞: not “he is absent-minded,”不是「he is absent-minded」（他很心不在焉） but “his absent-mindedness made him miss the stop.”而是「his absent-mindedness made him miss the stop」（他的心不在焉害他坐過站）. People treat it as a small human failing大家把它當成一個小小的人性弱點, often linked with being busy or living in your head常常跟忙碌或活在自己腦子裡有關

Though actually, everyone has a bit of it when they are tired or worried; we only name it when it shows — the lost keys, the phone left on the bus. By itself it does not mean a disease.

Though actually不過事實上, everyone has a bit of it每個人都會有一點 when they are tired or worried在累或擔心的時候; we only name it when it shows只有在它顯現出來時我們才會特別去講它 — the lost keys像是弄丟鑰匙, the phone left on the bus或把手機忘在公車上. By itself it does not mean a disease這個字本身並不代表一種疾病

It is a slightly long, slightly bookish noun; in speech many people just say someone is absent-minded and leave it there.

It is a slightly long, slightly bookish noun它是一個有點長、有點書面語的名詞; in speech many people just say someone is absent-minded在口語裡很多人只會說某人absent-minded（心不在焉） and leave it there就這樣打住了