Immortality. One way is through your family and its sons who carry forward the family name, so to speak.

永垂不朽,一条路就是通过你的家庭,让儿子们来继承家族的姓氏,也就是说

耶鲁公开课 - 古希腊历史简介课程节选

So imagine the following example, an invader is thinking about invading a country, and there are two ways -- there are two passes if you like -- through which he can lead his army.

想象一下这样的例子,一个侵略者打算入侵一个国家,有两条路,想象成两个关口也行,侵略者必须通过一个才能进入

耶鲁公开课 - 博弈论课程节选