By A Sytem of ropes that make it eaiser to lift things that are to heavy to lift without help.
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The engine usually has an idler and/or tensioning pulley as well as a few pulleys that use the power of a traveling serpentine belt to drive components such as the alternator, a/c pump, etc. Any of the pulleys that have one or more grooves that assist to guide the belt(s) are, technically, sheaves. Idler or tensioner pulleys that are completely flat because the flat back of the belt rides on them are not sheaves, but are pulleys.
Helped us with weight loss.
They help us now make and invent new things that help us in our lives.
Roads help us because they allow us to easily and safely travel from point A to point B. In the United States alone, there are 3,980,817 miles of road.
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