"absence of mind"是一个名词短语，字面直译为“心智的缺失”，实际指“心不在焉；精神恍惚；注意力不集中”（a state of not paying attention to what is happening around you because you are thinking about something else）。
作为名词短语，它通常在句子中作主语、宾语或介词宾语，描述“注意力不集中”的状态或行为。
例：
Absence of mind caused him to forget his wife's birthday.
（心不在焉让他忘了妻子的生日。）
Absence of mind is a common reason for small mistakes.
（注意力不集中是犯小错误的常见原因。）
例：
She often shows absence of mind in class.
（她上课经常心不在焉。）
I had a moment of absence of mind and lost my train ticket.
（我一时恍惚，弄丢了火车票。）
He suffers from frequent absence of mind due to stress.
（由于压力大，他经常精神恍惚。）
例：
The accident happened due to his absence of mind while driving.
（事故是因为他开车时心不在焉。）
She spilled coffee on her desk because of a brief absence of mind.
（她因为一时走神把咖啡洒在桌上了。）
形容词形式：absent-minded（心不在焉的；健忘的），用来描述人。
例：He's an absent-minded professor who often forgets his own name.
（他是个心不在焉的教授，经常忘了自己的名字。）
同义词：inattention（不注意）、distraction（分心）、daydreaming（做白日梦）。
"absence of mind"是描述“注意力不集中”的名词短语，侧重“状态”；而形容词absent-minded侧重“人的性格或习惯”。使用时注意其名词属性，搭配动词或介词短语即可。