lì shǐ kè / shàng / lǎo shī / jiǎng dào / dà yuè jìn / shí qī / yì xiē / dì fāng / tǔ fǎ liàn gāng / de / qíng kuàng

历史课上，老师讲到大跃进时期一些地方土法炼钢的情况。

In history class, the teacher discussed primitive steelmaking in some areas during the Great Leap Forward.