lì / shǐ / kè / tǎo / lùn / le / duō / gè / guó / jiā / céng / jīng / chū / xiàn / de / pái / Huá / qíng / xù历史课讨论了多个国家曾经出现的排华情绪。The history class discussed anti-Chinese sentiment that once appeared in several countries.