有一个故事,大意如下:一个剑术高超的剑师想把他的三个儿子培养成剑道高手。为了择其优而教之,他想了个办法来考他们。一天,他分别在三个儿子的房门上放了一把扫帚,并将门虚掩,然后躲在暗处看他们的反应。 There is a story with the following effect: A superb fencer wants to develop his three sons into a kendo master. In order to choose his superior and teach, he thought of a way to test them. One day he put a pair of brooms on the doors of the three sons, respectively, and the door was concealed, then hiding in the darkness to see their reaction.