lì shǐ kè / shàng / lǎo shī / xiáng xì / jiǎng jiě le / Sān guāng Zhèng cè / gěi / zhōng guó rén mín / dài lái de / jù dà zāi nàn

历史课上，老师详细讲解了三光政策给中国人民带来的巨大灾难。

In history class, the teacher explained in detail the huge disaster the Three Alls Policy brought to the Chinese people.