That piece of green shield.

那块绿色盾牌。

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Every "green shield" has an only serial number registered in operation management system. Traffic police can find out targeted taxi's information within 50-80m through the "green shield".

每个“绿盾”内都有与运政管理系统相对应的唯一编号，交通执法部门可以通过车载读写器就可以在50到80米外稳定读取车内“绿盾”的信息。

youdao

The only green shield was the Grass Crest shield.

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