产生误差的平均速度是每秒4米。
Some studies suggest that straight, horizontal bars painted across roads can initially cut the average speed of drivers in half.有研究表明,在道路上画上笔直的横杆,可以在开始将司机的平均速度降低一半。
On two separate morning visits to the scientists' lab, each man walked for an hour at an average speed that, in theory, should allow his body to rely mainly on fat for fuel.在科学家的实验室里,每个人分别在上午的两次访问中,以平均速度走了一个小时,理论上,他的身体应该主要依靠脂肪作为燃料。