Erstwhile
adv. 以前, 往昔地\\na. 以前的, 往昔的
✅ 同义词
🗣️ 情景例句
I just took the wrong train.
只是我坐错了车。
The abundance of money ruins youth.
钱多毁青年。
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。