Unverified70% confidenceTradeoffTime unknown
轻便性与耐用性的权衡：塑料外壳约15-25g更适合幼儿颈部承重，但抗摔性差；金属外壳更耐摔却重达40g以上，长时间佩戴幼儿易不适并想摘掉
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70%
Confidence
Long-term
Relevance
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