\u0039\u0031\u0031\u67E5\u8BE2\u00B7\u82F1\u8BED\u5355\u8BCD
原级：vacillate
第三人称单数：vacillates
现在分词：vacillating
1. For more than a century the nation has vacillated between a superiority complex and an inferiority complex.