单词：optically active
optically active的用法和样例：
例句
- Slow crystal formation gives quite pure crystals that probably need not be recrystallized for the optical activity studies.缓慢的结晶过程会给出十分纯的晶体，在光学活性的研究中，这些晶体很可能不需要进行再结晶了。
- The racemate is optically inactive.外消旋体是不旋光的。
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