lì / shǐ / kè / shàng / lǎo / shī / jiè / shào / le / Mǎn / zhōu / guó / de / xíng / chéng / hé / fù / miè历史课上,老师介绍了满洲国的形成和覆灭。In history class, the teacher explained the formation and collapse of Manchukuo.