vehicle performance problem
车辆性能问题
以上为机器翻译结果，长、整句建议使用 人工翻译 。
If we do the testing on the vehicle, the results are relatively well, but the cost is high and there is a problem on security, so people design professional testing equipments to test its performance.
若在实车上进行测试，测试效果比较好，但成本高，且有一定的安全风险，因此一般通过设计专业的测试装置来测试其性能。
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