concentration

复数：concentrations

1. [U]专心,专注 the direction of attention on a single thing,idea,subject,etc.
2. [C]集中,集结 a close gathering

• disrupt〔disturb〕 one's concentration扰乱注意力
• lose one's concentration分散注意力

• considerable concentration高度集中的注意力
• deep concentration聚精会神
• high concentration高浓度
• large concentration of population人口高度集中
• low concentration低浓度

• concentration camp集中营

• in concentration专心地
• power of concentration集中思想的能力
• with concentration专心地

• concentration of fire火力集中
• concentration of sea water海水浓缩
• concentration on对…的专注
• concentration on civil rights对公民权利的专注

concentration of sth集中；聚集

high concentration高浓度，高强度

stress concentration应力集中

concentration on注意力集中于…

low concentration低浓度；低集中度

gas concentration气体浓度；气含量

sediment concentration含沙量；沉积物浓度

solution concentration溶液浓度

ion concentration离子浓度

dust concentration粉尘浓度；尘末浓度

mass concentration质量浓度

concentration camp集中营

initial concentration起始浓度；初浓度

salt concentration盐浓度，含盐浓度

concentration ratio集中度；浓度比率

concentration factor集中系数；浓缩系数

alcohol concentration酒精浓度

concentration polarization浓差极化

stress concentration factor应力集中系数

volume concentration[化]体积浓度；体积密度

1. The tennis players need total concentration during play.
   网球运动员在比赛中需要全神贯注。
2. Stress and tiredness often result in a lack of concentration.
   紧张和疲劳常使人精神不集中。
3. Concentration is essential if you want to do a good job.
   如果你想把事情做好,专心是必要的。
4. His area of concentration is economics.
   他专心研究经济学。
5. Check oxygen concentration by a refractometer.
   用折射仪测量一下氧气的浓度。
6. Titanium is useful at low concentration only.
   钛只在低浓度时起作用。