It's a family business, it may not bring in a lot of money, but it keeps the family together.
这是家族生意,虽然不一定可以赚大钱,但可将整个家庭凝聚在一起。
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。