"胡老师上课" (Hú lǎoshī shàngkè) 表示 "Teacher Hu is giving a lesson"。

这个短语的来源是汉语普通话，在汉语中 "胡" (Hú) 是一个常见的姓氏，"老师" (lǎoshī) 是 "teacher" 的意思，"上课" (shàngkè) 是 "to have a class" 的意思。

下面是一些例句，希望能帮到你：

胡老师上课时，请同学们认真听讲。(Hú lǎoshī shàngkè shí, qǐng tóngxuémen rènzhēn tīngjiǎng. Please pay attention when Teacher Hu is giving a lesson.)
胡老师上课很生动。(Hú lǎoshī shàngkè hěn shēngdòng. Teacher Hu's lessons are very pvely.)
你们有没有问胡老师上课的问题？(Nǐmen yǒu méiyǒu wèn Hú lǎoshī shàngkè de wèntí? Do you have any questions for Teacher Hu during the lesson?)