Undocumented
a. 无正式文件的, 无事实证明的
🗣️ 情景例句
Too easy?
太简单？
He looks much younger than he is.
他看起来比他实际上年轻得多。
Even seemingly insignificant remains can shed interesting light on the history of early man.
即使看起来微不足道的遗物，也可能揭示人类早期历史的一些有趣的内容。