I killed two birds with one stone and picked the kids up on the way to the supermarket.我在去超市的路上顺便接了孩子，一举两得。We can kill two birds with one stone by dropping off the mail when we go to the grocery store.我们可以在去杂货店时顺便寄信，这样就能一举两得了。Now we could kill two birds with one stone if we were clever.我们要是聪明的话，这下子就可以一举两得了。