How do I Say and Write
"Concentration" in Chinese?

Pronunciation : Con`cen*tra"tion
Part of Speech : n.
Etymology : [Cf. F. concentration.]
Definition : 1. The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration. Concentration of the lunar beams. Boyle. Intense concetration of thought. Sir J. Herschel.

2. The act or process of reducing the volume of a liquid, as by evaporation. The acid acquires a higher degree of concentration. Knight.

3. (Metal.)

Defn: The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water.
Source : Webster's Unabridged Dictionary, 1913