Perrault agreed. They were moving quickly, and covering more ground every day the snow was good and hard, and no new snow fell.

佩诺特也同意这一说法。他们赶路很快。每一天都多赶路。雪地又平又结实, 没有新雪落下来。

So if chemical reactions only work when particles bang into each other good and hard, just how hard do they have to bang into each other?

因此，如果化学反应只有在粒子良好且强烈地相互碰撞时才会发生，那么它们相互碰撞的强度到底有多大？

One of them spoke with the boat's captain. If you hit an underwater rock, he said, hit it good and hard, so we will all go to the bottom.

其中一位医生和船长谈话，" 如果你撞到水下的岩石，" 他说，" 撞得准一点、猛一点，那样我们就都会沉入水底。"