zài / yǔ / fǎ / kè / shang / , / lǎo / shī / xiáng / xì / jiǎng / jiě / le / shí / cí / de / tè / diǎn / 。在语法课上,老师详细讲解了实词的特点。In grammar class, the teacher explained the characteristics of content words in detail.