"人人都理解的事物" 可以翻译为 "something that everyone understands" 或 "a thing that is universally understood"。
"something that everyone understands" 更口语化、日常化，适用于大多数场景。
"a thing that is universally understood" 语气稍正式，强调普遍性，适合学术或正式语境。
根据具体需求选择即可。