He's pushing a little bit harder. He really put his back into it.

现在考虑更多的例子。

No harm in putting his back into it then for a bit, working a little harder for the moment—it would hurt no one, and might do himself good.

那时让他背上一会儿并没有什么害处，暂时更努力地工作——这不会伤害任何人，而且可能对他自己有好处。