如果它飞走了，它就再也不会回来。

If it flew away, it would never return.

youdao

如果把鸟儿放出笼子，它肯定会飞走的。

If the bird is let out of its cage, it will certainly fly away.

youdao

如果它结束了，那就让它走吧就像明天会到来一样那样的昨天，那样的昨天我只是一只早已飞走的鸟。

If it's over, let it go and come tomorrow it will seem... so yesterday, so yesterday. I'm just a bird that's already flown away.

youdao