骑自行车的人在人行道上跳上跳下,并且沿着人行道高速行驶。
Hiking groups, a group of people who are enthusiastic about walking, running or hiking, are often seen walking at full speed along the street.暴走团是一群热衷于走路、跑步、远足的人,人们常常看到他们沿着街道全速行走。
I'm moving at unit speed along this line.我以单位速度延沿线移动。