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1.The engineer used a push-pull jack to lift the heavy machine.
工程师使用一个推拉千斤顶来提升这台重型机器。
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2. The construction workers needed a push-pull jack to move the heavy beams.
建筑工人需要一台推拉千斤顶来移动这些沉重的梁。
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3.The carpenter used a push-pull jack to remove the old floorboards.
木匠使用一台推拉千斤顶来移除旧的地板板。