Unverified82% confidenceDecision RuleTime unknown
无痕内衣的下围拉伸后回弹率应≥85%，测试方法为将下围横向拉伸至松弛状态的1.5倍后松手，若无法快速回弹或出现明显变形，说明弹力网层已老化或质量不足，穿着几小时后会上移勒痕
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