求翻译：一次，几位学生经过三节课的学习，感到疲倦，就伏在课桌上打瞌睡。此时，教师停止了讲课，用诙谐的语言讲道：“听说有一只小企鹅，在跟师傅垒巢时，总是爱把头和长长的脖子贴到地面上呆一会儿。它师傅问：‘你这是什么意思？’小企鹅回答说：‘我是对师傅的礼貌。’由此我深受启发：有的同学上课总喜欢把头贴在桌子上，可能也是对教师的礼貌吧！”话音刚落，学生哄堂大笑，几个睡觉的同学在笑声中被惊醒，羞愧自惭。是什么意思？

Time, several students after three lessons to learn, feel tired, fall asleep on the V on the desk. At this point, the teacher stopped the lecture, with humorous language sermon: "I heard a little penguin, with the master base in the nest, always love his head and long neck attached to the ground a f