Unverified85% confidenceDecision RuleTime unknown
牵引绳有效长度选择1.5-2米为宜：低于1米孩子活动空间受限易被拉扯摔倒，超过2.5米则失去防走失意义，人流拥挤场所（如车站机场）应可锁定在1.5米以内
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