Unobservable
a. 难以察觉的；注意不到的；不可见的
✅ 同义词
🗣️ 情景例句
Sorry. I have a meeting right now.
抱歉，我马上有个会议要开。
Which one is heavier?
哪一个是较重的？
After the train had left the station, the lady opened her handbag and took to her power compact.
火车开出车站后，那位妇女找开了手提包，拿出了粉盒。