邪之所凑，其气必虚for evil to encroach, qi4 must be vacuous
肾虚不能摄约小便vacuous kidney unable to contain urine
阴虚则内热when yin1 is vacuous, there is internal heat
空虚的vacuous
脉虚vacuous pulse
浮虚vacuous puffiness
气虚不摄vacuous qi4 failing to ensure containment
脾虚不固证pattern of vacuous spleen failing to secure