以往这个车载单元只是一个简单的装置，当车辆通过收费公路入口处时，这个装置就起到了一个无线电频率身份识别标签的作用，但这个装置也开始实现智能化了。
That used to be a simple device, working like a radio-frequency identification tag when it passes under a gantry on a toll road, but it is also getting smarter.
当车辆穿过第一识别装置，它已被记录在数据库中。
When a vehicle crosses the first recognition device, it is recorded in the database.
当车辆穿过第一识别装置，它已被记录在数据库中。
When a vehicle crosses the first recognition device, it is recorded in the database.
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