but where had it come from?

但它是从哪儿来的呢？

One of Mary's prize possessions was a little white lamb which her husband had given her.

玛丽最珍贵的财产之一就是丈夫送给她的一只白色小羔羊。

Tramps seem to be the only exception to this general rule.

在这条普遍的规律前面，

She suddenly got into a panic and stopped her car.

她一惊之下突然把车停了下来。

Suddenly they came to a waterfall which dropped into an underground lake at the bottom of the cave.

突然，他们来到一道瀑布前，那瀑布奔泻而下，注入洞底一处地下湖里。

always assuming,of course, that the sea is calm.

当然，这一切只有在大海风平浪静的情况下才有可能。