Unverified85% confidenceDecision RuleTime unknown
下巴托槽（防滑卡扣）与背部安全扣必须同时具备：下巴槽防止头部前倾入水，背部搭扣防止婴儿挣脱，缺一不可
1
Sources
85%
Confidence
Long-term
Relevance
-
First Seen
Sources
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