基本解释n.负脉冲(下冲；幅度不足)同根派生 英汉例句drop-back short underswing upstart 支撑后倒弧形短振屈伸上backward underswing on horizontal bar 单杠上向后弧形摆动underswing and salto forward 弧形摆接前空翻underswing kip 长振屈伸上short underswing 短振