timing-gear train

例句：

1. 1.The timing-gear train has been running smoothly for the past few months.
   这种定时齿轮列车在过去几个月里运行得非常顺畅。
2. 2.The timing-gear train is a popular mode of transportation in our city.
   这种定时齿轮列车是我们城市一种受欢迎的交通工具。
3. 3.The timing-gear train will take us to our destination in just over an hour.
   这种定时齿轮列车将用不到一个小时的时间把我们带到目的地。