Unverified75% confidenceTradeoffTime unknown
承重与静音的矛盾：加厚双轨（承重强）比单轨阻力大、更易积尘影响顺滑，若帘重<1.5kg/米单轨足够，重帘才需双轨或加固轨道
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75%
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Long-term
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