Underwool
n. （动物的）内层绒毛； 羊绒
🗣️ 情景例句
In fact, I love what I do ...
事实上 我热爱我的工作……
A thousand friends are few, one enemy is too many.
朋友千人尚觉少，仇敌一人犹嫌多。
but that was precisely the idea adopted in some of the early instruments (seismometers) for recording earthquake waves.
但是早期记录地震波的仪器（测震仪）正是采用了这种思路。