vertical trajectory垂直: perpendicular; vertical; squ ...弹道: trajectory; pathway; path; b ...直弹性轴: axis of direct elasticity弹道: [航] (弹头射出后所经的不对称弧形路线) trajectory; pathway; path; ballistic curve磨牙正直弹簧: uprighting spring for molar下载手机词典可随时随地查词查翻译