indispensability
n. 不可缺少
1. the quality possessed by something that you cannot possibly do without
This electric drill is a indispensability special equipment at rag trade.
該電鎖是服裝工業不可缺少的專用裝置之一.
Body and mental state are two aspects of body indispensability, they are mutually to contact interaction.
身體與心理是人體不可缺少的兩個方面, 他們是相互聯絡相互作用的.