We have to get that fence up in the backyard before the pool's finished. -I know.

我们得在游泳池完工前把后院用围栏围起来。-我知道。

These fences back up to personal properties.

那些栅栏是保护个人财产的。

They put a fence up around it.

他们用栅栏把房子围起来了。

So I think that's how you build the fence up upfront in the expectation that somebody would find the way to crack it.

所以我认为这就是你如何预先建立围栏，期望有人会找到破解它的方法。