不知道你的解释来自什么地方，其实 always come back 就是它的字面意思——“总会回来”，具体翻译时需根据不同语境灵活处理，如：

We can always come back for more. 我们随时可以再来要。

I always come back to the same town for a holiday as it’s so nice. 我总是回到这座城市来度假，它真美。

A good travel agent knows that a satisfied customer will always come back. 好的旅行社知道，满意的顾客还会再来。

If your new arrangement doesn’t work out, you can always come back here. 如果你新的安排不顺利， 你随时都可以回来。