... single step 单步 ; 单级 ; 单步执行 ; 单一步骤测试 single pulley 单滑轮 single drill 纱斜纹 ; 纱卡其 ...
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起先，金格·里奇还以为这两根骨头分别来自动物左右腿的单滑轮踝骨——这也能证明之前鲸的起源推测是正确的。
At first Gingerich thought the two bones were the single-pulley astragali from the animal's left and right legs-proof that he'd been right about the origin of whales.
料斗升降机是起重机械中的一种单斗提升的升降机，一般由带走轮的料斗、轨道及其支架、牵引绞车和滑轮组成。
The hopper elevator is a kind of single bucket elevator, which is composed of a hopper, a rail and a bracket, a traction winch and a pulley.
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