Eurypterida
板足鲎类
🗣️ 情景例句
It's time I was off.
我该走了。
Whose responsibility are the shipment charges?
运费由谁来负责呢？
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。