Cushion can turn over changeover to use, answer to retroflexion every week, make wear away to distributing equably.
垫子可翻转换用,应每周翻转一次,使磨损均匀分布。
But the Qian 'an dialect hasn't retroflex finals, this phonetic feature and other factors make it's r-ending retroflexion compared with ther-ending retroflexion in Beijing demonstrate own feature.