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1. libration means minor swaying motion of a dipole with nearly fixed orientation, ÓеãÏñµ¥°ÚµÄÑù×Ó¡££¨ref. http://en.wikipedia.org/wiki/Libration_(molecule)£©¶øvibrationÔòÊÇ·Ö×ÓdipoleÕñ¶¯Ê±´óµÄorientationµÄ±ä»¯¡£
2. µÍƵ·å´ó¶àÄܰïÖú¶Á³ö·Ö×ӵľ«È·½á¹¹£¬ÓÈÆäÊǼüËù´¦µÄ»¯Ñ§»·¾³µÈµÈ£¬as libration is subject to external forces or constraints that restrict its orientation.

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