1·Some theories of morally correct action also introduce the category of the supererogatory: an action is supererogatory if and only if it is morally praiseworthy, but not obligatory.
有些道德正确的行为的理论还引入了多劳类别：一个行为当且仅当它在道德上值得表扬但不是义务时就属于多劳类别。
2·VHTML which we design has some strong points: (1)Because VHTML is based on the HTML, it will take a few supererogatory efforts for programmers to master VHTML and use it to develop WWW applications;
我们所设计的垂直标记语言VHTML具有以下一些优点：（1）由于语法同HTML几乎相同，因此用户学习、利用VHTML协议来开发万维网应用程序所需耗费的 额外代价是非常少的；