常见例句双语例句After ra gentle warm-up, sprint hard up the stairs as fast as you can for 20 (building to 30) seconds, then slowly recover as you walk back down.在温和的热身运动之后，以你能达到的最快的速度冲上楼梯，时长约为20-30秒，接着慢慢走下来以恢复。 返回 walk up building