单词：selection rule
selection rule的用法和样例：
例句
- Forbidden transitions are those for which dipole radiative transitions are not allowed by the selection rules.禁戒跃迁指的是选择定则所不容许的偶极辐射跃迁。
- The relaxation of Raman selection rules in cubic nanophase is attributed to local rhombohedral distortion.拉曼选择定则的弛豫源于纳米晶基体具有局域三方晶格畸变。
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