Unobservable
a. 难以察觉的；注意不到的；不可见的
✅ 同义词
🗣️ 情景例句
You know, when I was your age,
要知道 ，当我像你这么大的时候，
I'm too old.
我太老。
Eric had been the eldest son of the family, very much older than his two brothers.
埃里克是这家长子。