Vocabulary consisting only from characters you are able to read
学長
がくちょう
university presidentmix
係
かかり
official, duty, person in chargemix
都道府県
とどうふけん
administrative divisions of Japan: Tokyo-to, Hokkai-do, Osaka-fu, Kyoto-fu and remaining prefectures/(P)mix
The curvature of a circle is constant.math