变: become different; change肥: fertilizer; manure变废为宝: turn “waste” into wealth; change waste material into things of value; recycle waste material变放大率透镜: variable magnification lens变废为宝的: waste to energy变房虫目: ataxophragmiida变沸石: metazeolite变方与变积分析: analysis of variance and covariance变分: [数学] variation变方向切入: reverse cut变分波函数: variational wave function变方向的球: breaking ball