indispensability

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設備之一.

互聯網

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, 他們是相互聯系相互作用的.

互聯網