视频对白:

By and by,they forger everything.
渐渐地，他们忘记了一切。

by and by

a.不久；后来

It's very likely to clear up by and by.
很可能不久要放晴了。

We'll meet again by and by.
我们不久又会再见。

By and by, the moon began to appear.
不久，月亮开始出现。

By and by, however, he began to gain courage.
不过，后来他逐渐胆大了。

At first he felt it awkward, but by and by he got used to it.
起先他感到棘手，后来就习惯了。