1. Improve experiment device and experiment method and make experiment concentrated green and miniature. 改进实验装置和实验方法，使实验高效、绿色、微型化。
2. These cocktails are either made from reagents or purchased in concentrated form and diluted with toluene. 这些混合液或是由试剂配制的或是买来的用甲苯稀释的浓缩剂。
3. Ample oil reserves are still being discovered the world over, but they happen to be concentrated increasingly in the Middle East. 世界各地仍在不断发现丰富的石油储量，但石油储量碰巧是越来越集中在中东地区。
英英解释
adj.
1. gathered together or made less diffuse
2. of or relating to a solution whose dilution has been reduced
3. intensely focused
4. (of light) transmitted directly from a pointed light source
5. being the most concentrated solution possible at a given temperature; unable to dissolve still more
