经前情绪障碍(PMDD)是PMS中最严重的形式，表现为愤怒、易激惹、精神紧张。
Premenstrual dysphoric disorder (PMDD) is the most severe form of PMS, with the prominence anger, irritability, and internal tension.
扭曲构象为较好的发光构象。分子受激后，平面构象可经旋转松弛到扭曲构象。
The twisted conformation was favorable for luminescence, and the excited coplanar molecule could relax to the twisted conformation.
扭曲构象为较好的发光构象。分子受激后，平面构象可经旋转松弛到扭曲构象。
The twisted conformation was favorable for luminescence, and the excited coplanar molecule could relax to the twisted conformation.
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