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block and tackle

noun
🔊/ˌblɒk ən ˈtækl/
🔊/ˌblɑːk ən ˈtækl/
[singular]
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  1. a piece of equipment for lifting heavy objects, which works by a system of ropes and pulleys滑轮组；滑车组
     (= small wheels around which the ropes are stretched)