In the past, price was the key factor when purchasing an internal transport system that consisted, for example, of an electric forklift truck, traction battery and battery charger.
在过去，当人们购买内部交通系统，包括电动叉车，牵引电池和电池充电器时，价格是关键因素。
A transport resides at the edge of a system and when it detects an event it issues a corresponding internal root request.
传输通常存在于系统边界，当它侦测到事件发生的时候，它会发送一个对应的内部请求。
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