| 释义 |
〔second〕The transmission gear or gear ratio used to produce forward speeds higher than those of first and lower than those of third in a motor vehicle.第二档：机动车中使前进速度比第一档高而比第三档低的传送档或档级〔headway〕Forward movement or the rate of forward movement, especially of a ship.前进速度：尤指船向前的运动或向前运动的速度 |