outlay的过去式怎么变化

　　例句：

　　The best equipment is costly but is well worth the outlay.

　　最好的设备花费大，但这种开支很值得。

　　Their initial outlay was relatively small.

　　相对来说，他们最初的费用不多。

　　In terms of cash outlay, the sum is peanuts.

　　从花费来看,这笔钱乃区区小数。