高帝欲废太子，立戚夫人子赵王如意。大臣谏，不从。吕后使吕泽劫留侯画计。留侯曰：“此难以口舌争也。顾上有不能致者，天下有四人。四人者年老矣，皆以上慢侮人故，逃匿山中，义不为汉臣。然上高此四人。诚能不爱金帛，令辩士持太子书，卑辞固请，宜来。来以为客，时时从入朝，令上见之，则一助也。”吕后如其计。

    汉十二年，上疾甚，愈欲易太子。叔孙太傅称说引古今以死争，上佯许之。及宴，置酒，太子侍，四人者从，年皆八十余，须眉皓然，衣冠甚伟。上怪而问之，四人前对，各言姓名，曰：东园公、甪里先生、绮里季、夏黄公。上乃大惊曰：“吾求公数岁，公辟逃我，今公何自从吾儿游乎？”四人皆曰：“陛下轻士善骂，臣等义不受辱，故恐而亡匿。窃闻太子为人仁孝，恭敬爱士，天下莫不延颈欲为太子死者，故臣等来耳。”上曰：“烦公幸卒调护太子。”四人为寿^①已毕，趋去。上目送之，曰：“羽翼已成，难摇动矣。”

【注释】①为寿：祝颂之辞。向尊长敬酒或馈赠财物，以祈祝健康长寿。

    We eat food with the help of hands every day. It is possible for some germs(细菌) to get into our bodies. So it is important to know how to wash hands in the right way.

    A piece of news from CCTV says that students from Guangzhou have a good way of learning how to wash hands. They learn it through doing hands-washing exercises during the ①break. The teachers there say most students wouldn't like to listen but they like to act. So now the students are interested in the interesting exercises. They are learning carefully. ②They want to be teachers for their parents and friends after they learn them well.