请在保留关键事实、主旨一致的基础上，以英文改写以下段落：“经过反复的实验对比，研究人员发现，在进行实车测试时，仅能被掌握并实施代客泊车技术的参与者平均完成了约75%的停车任务，而使用裸车的用户则达到了87%。这说明代客泊车技术在实际使用中存在一定的效率问题，仍需进一步优化与完善。”
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After repeated experimental comparisons, researchers found that participants using Valet Parking technology only managed to complete about 75% of parking tasks during real-vehicle tests, while users operating unassisted vehicles achieved 87%. This indicates that Valet Parking technology, while functional, faces efficiency issues in practical applications and requires further optimization and refinement.
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