concentrate/concentration

concentrate /ˈkɔnsəbtreit/ vt. & vi. 1.集中，聚集，专心: concentrate one’s attention (energies, efforts, mind) (up) on… 集中某人的注意力(精力，努力，心思)于… ；concentrate gunfire against the enemy’s position 集中炮火轰击敌人的阵地 The troops concentrated near the station. 部队在车站附近集结。Many firms are concentrating on increasing their markets overseas. 许多公司正全力以赴扩展它们的海外市场。You’ll solve the problem if you concentrate upon it. 如果你全神贯注，你就能解决这个问题。 2.浓缩: concentrate a solution by evaporation 通过蒸发浓缩溶液 

concentration /kɔnsənˈtreiʃən/ n. ［u］ 1.集中；专注，专心：cultivate mental concentration 培养集中思想的能力；demand/need/require all one’s concentration需要全神贯注；read with deep concentration 聚精会神地阅读；a boy with great (little) power of concentration 精力非常(不容易)集中的小孩 2.浓度；浓缩：What is the concentration of salt in sea water? 海水中盐的浓度是多少? On concentration of sea water we obtain salt. 海水经浓缩后得到盐。