concentration

• His concentration was intense .
  他全神贯注。
• The altitude of the peak concentration was lowest in the summer .
  在夏季，峰值浓度的高度为最低。
• At low concentrations these effects are small and variable .
  在低浓度下，这些影响很小并且是形式多变的。
• The latex concentration is raised by evaporation or centrifugation .
  通过挥发或离心作用提高胶乳的浓度。
• It also contains high concentrations of proline and hydroxyproline .
  它还含有高浓度的脯氨酸和羟脯氨酸。
• The expression of pain and concentration returned to piggy's face .
  痛苦和专注的神色又回到了猪崽子的脸上。
• These are more commonly described as the "labile" metal concentrations .
  这些通常称之为“不稳定”金属浓度。
• A large proportion of the fluorine is vaporized during the concentration process .
  在浓缩过程中大部份氟蒸出。
• At lower concentrations they may even be stimulants of cell division .
  在浓度较低时，它们甚至能促进细胞分裂。