Rappel
n. 绕绳下降
🗣️ 情景例句
Did you remember your other appointment for today?
还记得今天的另一个约会吗？
Hoist your sail when the wind is fair.
随机应变。
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。