石头讲词：plunge [plʌndʒ] n. 投入；跳进 vi. 投入；陷入；跳进 vt. 使陷入；使投入；plunge into 跳进; 纵身投入; 同义词：n. 投入；跳进 investment, input n. 投入；陷入；跳进 plough into, throw one's self into n. 使陷入；使投入；使插入 let sb in for, let in for