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顾客的信任难获得易失去;永远不要视为理所当然。
The propensity to truck, barter, and exchange one thing for another is common to all men, and to be found in no other race of animals.
指贫穷的夫妻在生活中处处感到悲哀。
数字孪生技术将为采石场带来MRI扫描为医学带来的变革。