吴语德清方言的声调系统中有个罕见现象:阴阳入声的喉塞尾已经脱落,但依旧保留短调,并分别与阴阳上声的调形同型。德清话的入声情况,说明长短有必要成为声调描写的一个参数,并为中古促声到现代舒声的演化阶段提供了一个例证。 Wu Yu Deqing dialect tone system has a rare phenomenon: the yin and yang into the voice of the tail has fallen off, but still keep the short tone, and respectively, the tone of yin and yang on the same shape. Deqing dialect entry conditions, indicating the length of the tone necessary to become a parameter description, and to promote the ancient sound to the modern sound of the stage of evolution provides an example.