Proem
n. 序言, 开端, 开场白
✅ 同义词
🔴 反义词
🗣️ 情景例句
Dad was a busy doctor,
爸爸是个很忙的医生，
Bye!
再见啦！
The second marks the arrival of transverse vibrations which travel more slowly and arrive several minutes after the first.
然后记录下的是横向波的到达，横向波比纵向波传播得慢，在纵向波到达几分钟后才能到达。