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润：细腻光滑。象珠子一样圆，象玉石一样光润。比喻歌声宛转优美，或文字流畅明快。
[round as pearls and smooth as jade;smooth and sweet;smooth and easy] 如珠之圆,如玉之润。形容文字圆熟或歌喉美妙动听
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