The non-tone quality phoneme is an important and difficult point in he teaching and coaching of Putonghua.
非音质音位的教学与辅导是普通话教学中的一个重点和难点。
The past decade has seen an explosion in non-surgical techniques that improve the quality, tone and color of aging skin.
过去十年已经看见用改进老化的皮的质量，音调和颜色的非外科的技术的一次爆炸。
The past decade has seen an explosion in non-surgical techniques that improve the quality, tone and color of aging skin.
过去十年已经看见用改进老化的皮的质量，音调和颜色的非外科的技术的一次爆炸。
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