Death Inverted is the door that not close, the old habit that returns to repeat a lesson.

反置的死亡是没有关闭的门，如同重复发生的陋习。

youdao

If you have trouble with a lesson, repeat it the next day.

如果你对一课没有掌握，第二天要温故这一课。

youdao

One of the dullest boys at a village school, more than thirty years ago, went up to repeat his lesson one morning; and, as usual, did not know it.

三十多年前，在一所乡村学校里，有一个十分愚笨的男孩，一天早上他上去复习他的功课；和往常一样，他都不懂。

youdao

Best of all for the venerable defense contractor and auto parts maker, it learned a lesson in fashioning swords into plowshares it can now repeat rapidly.

FORBES: Swords into Dow shares