Do you want to do something this Sunday? John and I would like you to come over for a party.
你星期日要不要做什么事?约翰和我想请你过来参加宴会。
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。