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pulley block [英] [ˈpulɪ blɒk] [美] [ˈpʊli blɑk] [短语] 滑轮组 词频排名 52744/55435 学习人数 86 难度等级 3/10 认知比例 28.12% 例句 A pulley block is needed to lift that heavy machine. 要吊起那么重的机器需要使用一个滑轮组。 dynamic rope for adjusting pulley block 调整滑轮组用跑绳 助记 联想 block and tackle n.滑轮,滑车设备
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