pay for itself
释义
自付：在一段时间内节省的钱与初始成本相等。
例句
1·The rail pass will pay for itself after about two trips.
火车月票大约只需乘两次车就够本了。
《牛津词典》
2·But the system should pay for itself within six years.
不过系统本身会在6年内赢回投入。
3·Yet the Soviets never managed to make it pay for itself .
可是，苏联从未成功地令它为自己的存在提供足够的经济价值。
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