Boats could carry heavy weights, but canals could not cross hilly terrain; turnpikes could cross the hills, but the roadbeds could not stand up under great weights.
船可以运载重物，但运河不能穿越丘陵地带；高速公路可以翻山越岭，但路基承受不了巨大的重量。
By lifting heavy weights, you are sending a signal to your body that you want to preserve your muscle mass, and that you only want to lose fat, not muscle.
通过举起重物，你在向自己的身体发送一个信号：你想保持身体的肌肉，你只是想减掉脂肪而不是减掉肌肉。
Pictures show the robot walking, lifting heavy weights, using power tools, performing press-ups and even driving with Russian experts hoping it will one day be able to help build a base on the moon.
图片显示，这个机器人能行走、举重、使用电动工具、做俯卧撑，甚至还能开车。俄罗斯专家希望他未来能够帮忙建立月球基地。
Jack: in practical mechanics, portable hand-operated device for raising heavy weights through short distances, exerting great pressures, or holding assembled work firmly in position.
千斤顶：在应用力学中，指携带方便、以手操作的装置，可将重物稍微抬高，能施加巨大压力，或将装配好的对象牢固地支撑在原地。
Jack: in practical mechanics, portable hand-operated device for raising heavy weights through short distances, exerting great pressures, or holding assembled work firmly in position.
千斤顶：在应用力学中，指携带方便、以手操作的装置，可将重物稍微抬高，能施加巨大压力，或将装配好的对象牢固地支撑在原地。
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