geezer2 Publish time 2014-12-08 01:29:49

Ying system

<p>Several times throughout the training I have read the term "ying system."  I am not clear, what is meant by the term "ying system"    Thanks for your reply&gt;</p>

tutor Publish time 2014-12-23 21:55:35

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<p>Did you learn the course B?</p>
<p>It's one of the differentiation methods, the Wei Qi Ying Xue differentiation.</p>
<p>The Ying system is basically equasl to the Ying Qi.</p>
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