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业务层还控制着可变速度标识,车道结束标志和许多可变信息标志。
The operational layer controls also variable speed signs, lane closing symbols and variable message signs.
youdao
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业务层还控制着可变速度标识,车道结束标志和许多可变信息标志。
The operational layer controls also variable speed signs, lane closing symbols and variable message signs.
youdao