He expresses himself with exceptional lucidity.他条理清晰地表达自己的观点。

His writings were marked by an extraordinary lucidity and elegance of style.他的作品文笔格外洗练雅致。

The pain had lessened in the night, but so had his lucidity.夜里他的痛苦是减轻了, 但人也不那么清醒了。