The drills, complete with tips from Professor Poo – an emoji-like turd with glasses and a handlebar moustache – have so far sold 1.83m copies.

目前为止，这套练习簿已经销售了183万册，书中做指导的“便便教授”是一个留着八字胡、带着眼镜的表情形象。

"I want to make boring study more fun," the publisher, Shuji Yamamoto, told the Mainichi Shimbun newspaper.

“我想让枯燥的学习变得更有意思”，《便便汉字练习簿》书出版商山本修司对《每日资讯报》表说。

Yamamoto, a 40-year-old former Lehman Brothers employee who founded his own publishing company seven years ago, said: "I'm an extremely ordinary person. So I know what most ordinary people want. I know what is likely to sell."

现年40岁的山本曾是雷曼兄弟银行的员工，7年前他创办了自己的出版公司，他说：“我是一个非常普通的人。所以我知道大多数普通人想要什么。我清楚什么可以卖出去。”

Written Japanese comprises 2,136 "regular-use" Chinese-based characters – or kanji – and the hiragana and katakana phonetic scripts. Hiragana is made up of 46 base characters that are often used as particles or to inflect verbs and adjectives. The same number of basic katakana symbols are commonly used to write foreign loan words.

日文中包括2136个“常用”的日文汉字、平假名和片假名音标，46个平假名通常用作小品词或修饰动词和形容词。片假名也有46个，通常用于外来词汇中。

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