Have the computational hygiene, if you like, to only go through accessors, only go through methods that are actually provided to you as you do this.

请大家注意计算卫生，如果你喜欢这么说的话，只通过访问器访问数据,当你访问数据的时候,通过提供给你的方法来访问。

麻省理工公开课 - 计算机科学及编程导论课程节选

Conversely, if I knew the velocity of this object, I also know what time it is, provided I knew the initial velocity.

反过来,如果我知道了这个物体的速度,我也同样可以知道时间,只要初速度是已知的

耶鲁公开课 - 基础物理课程节选