Unobservable
a. 难以察觉的；注意不到的；不可见的
✅ 同义词
🗣️ 情景例句
He's running for the school board.
他正在竞选联合校董会董事。
Fools have fortune.
戆人有戆福。
I know. I can help him with most of his subjects.
我知道。我可以帮助他学习绝大多数科目。