When you lead the meditation, I think kneeling is fine, but for me it's really painful, not everybody can do that.

当进行冥想时，我觉得跪地可以接受，但确实感到疼痛，不是人人都可以坚持。

普林斯顿公开课 - 人性课程节选

OK. Now, fortunately we're not going to start with Turing's six primitives, this would be really painful programming, because they're down at the level of, "take this value and write it onto this tape."

好了，现在，幸好我们能开始讲述,图灵的六个基本类型了，这会是非常痛苦的编程，因为它们只在这个阶段上，“拿到这个结果并写在这一卷磁盘上“

麻省理工公开课 - 计算机科学及编程导论课程节选

Cos I really struggled in high school-- a lot of it was difficult; a lot of it was painful, but it was all worth it.

因为我在高中很努力-,很多时很困难;,很多时很痛苦，但完全值得。

哈佛公开课 - 幸福课课程节选