Vocabulary consisting only from characters you are able to read
君
kun
suffix for familiar young malejlpt4
微分学
bibungaku
differential calculusmath
十日
tooka
ten days, the tenth day of the monthjlpt5, toki
大馬鹿
oobaka
extreme foolishness, utter foolmix
耳にする
miminisuru
to hear, to hear by chance, to hear by accident, to catch (the sound)suru