论文部分内容阅读
由成千上万个零部件组成的机车,成天跑个不停,难免会出现故障。运行中的机车出了故障,可不像自行车那样可以随便停在路
Locomotives, which are made up of tens of thousands of spare parts, run non-stop all day long and inevitably fail. Running locomotive out of trouble, unlike the bike that can be parked on the road