And so part of the wilderness experience for me I think Mark Twain talks about wilderness and he says, I do it chiefly because it is difficult.

对于我来说，荒野的经验就像是,马克吐温在谈到荒野时所说，因为困难，所以我才去做。

普林斯顿公开课 - 人性课程节选

Two massy Keys he bore of metals twain Now this is important to Milton.

他所掌有的成对锁钥,这里所讲的对弥尔顿而言非常重要。

耶鲁公开课 - 弥尔顿课程节选