You have the front, you have the back and then you have the thickness.

有正面，有背面，还有厚度。

He was working on the side facing zero, and had the front of his body and limbs burned.

他干活时正面对着爆炸中心，因此他的前胸和四肢都被灼伤。

Then you'll have the front of the board free and clear and this is where you'll want to add your breadsticks.

然后您将获得电路板正面的自由和清晰，这就是您要添加面包棒的地方。

As one critic put it: " If you look at a mule, you don't have the front end looking like a donkey and the back end looking like a horse."

“如果果你看一头骡子，不会正面看上去像一头驴，后面看上去像一匹马。”

So you have the front end running on things that you interface with, and back end running on things that are doing some work behind the scenes that you'd never see.

因此，前端在与你交互的事物上运行，后端作用于幕后做一些你永远不会看到的工作的事物上。