select_card 方法随机选取一张卡片，并将它赋给 @current_card 实例变量。

A select_card method picks a card at random and assigns it the @current_card instance variable.

youdao

一张精确的地图是很好的管理工具；罗盘的“正北原则”是领导和赋权工具。

An accurate map is a good management tool, but compass set on "true north" principle is a leadership and empowerment tool.

youdao

- So now if Christiana doesn't actually -- if either programmer or who's programming these little puzzle pieces, don't actually do anything with this return value, and I call, get int, she wants to hand this piece of paper -- to me, but if I don't actually assign -- no, no, I just messed up the demo.

现在如果Christiana没有-,如果程序员或谁在编写这段代码,不要对这个返回值做任何事情，我调用GetInt，她把这张纸给我,但是如果我没有赋值-,不，不，我刚才把这个演示搞乱了。

哈佛公开课 - 计算机科学课程节选