求翻译：3.教练车检修其动机，检修蓄电池，目的是保证有必需的启动转速。如果有必要提前检修起动机，不要发动不起了才想着修起动机，当然要根据自己教练车车子的使用情况最后确定，检修启动蓄电池，寒冷的冬天由于启动用蓄电池的特性，其电量最低可以降低一半，因此大大影响车子的启动转速和运转时间，直接反映到教练车车子的起动性能。至于怎样保养属于专业，在这里就不展开说了，最重要的一点是把教练车车子的蓄电池电液比重调到不低于1.29。以保证蓄电池本身不冻。电路要检查一下火花塞，调整一下间隙，必要时更换。是什么意思？

3. overhaul their motivation coach cars, repair battery, aims to guarantee the necessary startup speed. If necessary overhaul starter in advance, don't start to think of motivation, of course, according to their coach car car usage and the final decision, overhaul starting battery, characteristic of the cold winter months because of the starter battery, its lowest power can be reduced by half, therefore significantly affect the car's boot speed and running time, directly reflected in the coach cars starting performance of the car. How maintenance is professional, here is not to say, the most important point is the car battery-electric coach car not less than the proportion of liquid transferred to 1.29. To ensure that the battery itself is not frozen. Circuit to check the spark plug, adjust the gap, if necessary.