| 1. | She wrinkled her brows in concentration .
她蹙额皱眉，陷入沉思。 |
| 2. | S is the concentration of unpaired nucleotides .
S是不配对的核苷酸的浓度。 |
| 3. | Freckles are simply concentrations of melanin .
雀斑不过是高浓度的黑色素。 |
| 4. | This concentration is not dissipated by agents .
这一浓缩不会被媒介所冲淡。 |
| 5. | Some of the concentrations are negligibly small .
某些浓度小到可以忽略不计。 |
| 6. | Ambient concentrations varied considerably by season .
环境浓度随季节而大幅度变化。 |
| 7. | The colon is the locus of a large concentration of bacteria .
结肠是大浓度的细菌所在地。 |
| 8. | There was something pathetic in his concentration .
他那副专心致志的劲头看上去有点可怜。 |
| 9. | Higher salt concentrations alone may inhibit ion uptake .
单单只是盐浓度高就会阻碍离子吸收。 |
| 10. | At high calcium concentration they fuse without lysis .
在钙离子浓度高时，他们融合而不解体。 |
