| 11. | What is the concentration of salt in sea water? |
| 海水中盐的浓度是多少？
|
| 12. | I smoked with concentration and pleasure as I was sure that this would be my last cigarette. |
| 我聚精会神而又愉快地吸着这枝烟。因为我确信这是我最后一枝烟了。
|
| 13. | Ethanol is more effective at a concentration of 50-70 per cent; |
| 乙醇的浓度为50%至70%时比较有效，
|
| 14. | Concentration in ownership marks the distribution of income and wealth. |
| 财产所有权的集中，标志着收入与财富的分布情况。
|
| 15. | Thousands were reported to be working concentration camps. |
| 据报道那时有数以千计的人在集中营干活。
|
| 16. | He wrinkled his brow in concentration . |
| 他专心地蹙眉沉思。
|
| 17. | break sb's concentration |
| 分散某人的注意力
|
| 18. | a concentration camp |
| 集中营
|
| 19. | a book that requires great concentration |
| 需全神贯注才能看懂的书
|
| 20. | fierce concentration , loyalty, hatred |
| 极端集中, 忠诚, 痛恨
|