Critics of the technology say it involves too many moving parts, making it more complex and expensive to operate and maintain than competing technologies.
评论家说这种技术包含了太多的动部件，使得他的运行和维护很复杂。
The slow wagons of that time, usually drawn by horses, were too expensive for moving heavy freight very far.
那个时期的车厢通常是马拉的，很慢，把货物运送到遥远的地区要花很多的钱。
The slow wagons of that time, usually drawn by horses, were too expensive for moving heavy freight very far.
那个时期的车厢通常是马拉的，很慢，把货物运送到遥远的地区要花很多的钱。
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