从另一方面讲，OVal很容易使用，对约束条件也有很大的选择余地，若想要花少量力气就可向代码添加验证约束条件，它无疑是个上佳之选。
On the other hand, OVal's ease of use and wide selection of constraints make it a viable option for adding validation constraints to code with little effort.
你方价格是不是真的没有下降的余地了。
Your price really leaves not margin for reduction what so ever?
一方面，帕累托最优是指没有进行帕累托改进的余地的状态；另一方面，帕累托改进是达到帕累托最优的路径和方法。
On the one hand, Pareto optimal Pareto is no room for improvement in the state; on the other hand, Pareto improvement is achieved Pareto optimal routes and methods.
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