没有完全改变,只是
It hasn't completely changed. Just
以上为机器翻译结果，长、整句建议使用 人工翻译 。
车辆外观完全没有改变，只是安装了我们自主研发的车辆实时动态观察系统，解决了行驶中视角盲区的问题。
The appearance of trucks doesn't change, but they install the self-developed vehicle instant observation system, therefore the problem of blind angle is solved.
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