遥控车的遥控器上写着 SPEED-UP 和 SPEED-DOWN

遥控车的遥控器上写着 SPEED-UP 和 SPEED-DOWN Speed up HURRY UP!SPEED UP! velocity 和speed的区别 "speed"和'velocity"的区别 speed和amazing的用法 accelerate和speed的区别? speed up a little的意思 speed ...in和speed ...on的区别谢谢了, AT FULL SPEED和at high speed的区别. 关于网速的英文 download speed:up to 3Mbps upload speed:Up to 512Kbp touch screen to speed up