A craton includes a crystalline basement of commonly Precambrian rock called a shield, and a platform in which flat-lying or nearly flat-lying sediments or sedimentary rock surround the shield.

克拉通包含通常为前寒武纪岩石的结晶基底，即地盾，也包含围绕地盾的并在其上有平卧或近于平卧的沉积物或沉积岩层的地台。

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More severe heart failure causes swollen legs and the patient has difficulty breathing when lying flat.

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Romney, his campaign team and lawyers are flat-out lying, and he knows it.

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Lying flat on your back, for instance, may be good for the lower back but can exacerbate digestive and breathing problems and snoring.

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