con.cen.tra.tion
n.(名词)
The act or process of concentrating, especially the fixing of close, undivided attention.
专心:全神贯注的动作或过程,尤指专注的、不分散的注意力的集中
The condition of being concentrated.
全神贯注的状态
Something that has been concentrated.
经过浓缩的物品
Chemistry The amount of a specified substance in a unit amount of another substance.
【化学】 浓度:在某一单位物质中另一特定物质的含量