Yabla video uses of 学时

dào
zhōng
学时 xuéshí
已经 yǐjīng
掌握 zhǎngwò
le
波兰 Bōlán
é
希腊 Xīlà
拉丁 lādīng
yīng
děng
多种语言 duōzhǒngyǔyán
By high school, he had already mastered language like Polish, German, Russian, Greek, Latin, French and English.