You need, as a historian, essential triangulation from your subject and the only way you get that triangulation is through time.

You need, as a historian, essential triangulation from your subject and the only way you get that triangulation is through time.

作为一名历史学家，你需要从你的研究对象中得到必要的三角测量，而得到这种三角测量的唯一方法就是通过时间。

-- Ken Burns 肯·伯恩斯