To talk oneself hoarse; to speak at great length until one's tongue is worn out and lips are parched, often in an effort to persuade or explain.
为了给大家讲清楚这个复杂的问题，他真是舌敝唇焦，费尽了心力。
To explain this complex issue clearly to everyone, he truly talked until his tongue was worn out and his lips were parched, expending a great deal of effort.
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