这就如同牵引一个工具一样。
除非狗已经进展到触垫子训练和学习位置，否则人们一开始进行这项训练时不该把牵引带当作纠正工具使用。
When people first start this work they should NEVER use the leash as a tool to correct until after the dog has progressed to through touch pads and learning positions.
因此，该系统将成为铁路运营及牵引供电系统设计有利的计算机辅助设计工具。
Therefore, the system will be an advantageous computer-aided design tool for railway operation and designing the traction power supply system.
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