To speak continuously and engagingly without getting tired; to talk tirelessly and eloquently.
老教授在课堂上对古籍的精妙之处娓娓不怠地讲解了两个小时，学生们听得津津有味。
The old professor explained the subtle points of the ancient texts for two hours, speaking continuously and engagingly without tiring, and the students listened with great interest.
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