quora说的跟你刚好相反:
"At school":
- "At school" is commonly used to refer to the physical location of a school
or being present in a school environment [2].
- It can also describe a person's job or role within a school [2].
- Example: "I am at school right now, attending my classes" [1].
"In school":
- "In school" is used more generally to refer to the act of studying, usually
at a college or university, but not necessarily inside the school building at
that moment [3].
- It implies that the person is engaged in educational activities and
pursuing their studies [3].
- Example: "My sister is in school, studying psychology" [3].
【 在 idavailable 的大作中提到: 】
: 楼上都没说对！我来说明：这种情况就是in school!!!
: at school  表示行为是与学校本分事情有关的（比如工作、学校活动、学习）
: in school  表示在学校这个场所里的非本分行为。强调在这个场所里。吃东西明显跟
: 学习没啥关系，是最典型的in!!!
: ...................
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