Unverified82% confidenceDecision RuleTime unknown
降落伞玩具伞面直径40-50cm时下降平稳且展开可靠，直径＜30cm易翻转不开伞，＞60cm则受风影响大易飘走难回收
1
Sources
82%
Confidence
Long-term
Relevance
-
First Seen
Sources
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