You can watch the web-cast of this program if you have broadband access to the internet.
如果你能用宽带上网的话,你能在网上收看到这个节目。
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。