Unobservable
a. 难以察觉的；注意不到的；不可见的
✅ 同义词
🗣️ 情景例句
I'm really glad to see you.
非常高兴见到 。
If things were to be done twice all would be wise.
事事倘能做两次，人人都可称明智。
They are still lower than the quotations you can get elsewhere.
这些报价比其他任何地方都要低得多。