concentrating

concentrate, focus

这两个动词均有“集中，聚集”之意。
concentrate: 指把人或物集中在一起，也可指把精力或注意力集中于某一事物上。
focus: 侧重指把光、热、射线等集中于一点，也可指把思想或精力等集中于某人或某事情上。

动词 concentrate:

1. make (the solvent of a solution) dense or denser
   同义词：concentrate
2. direct one's attention on something
   同义词：concentrate, focus, center, centre, pore, rivet
3. make central
   同义词：centralize, centralise, concentrate
4. make more concise
   同义词：digest, condense, concentrate
5. draw together or meet in one common center
   同义词：concentrate
6. compress or concentrate
   同义词：condense, concentrate, contract
7. be cooked until very little liquid is left
   同义词：boil down, reduce, decoct, concentrate
8. cook until very little liquid is left
   同义词：reduce, boil down, concentrate

1. The threat of going bankrupt is very unpleasant but it certainly concentrates the mind.
   即将破产的威胁虽令人极烦恼，但确也能逼迫人开动脑筋。
2. The crowds concentrated round the palace.
   人群汇集在宫殿的四周。
3. I can't concentrate on my work when I'm tired.
   我累了就无法集中精力工作。