Driving to work through the rugged Precambrian Shield northeast of Winnipeg, he collided with an enormous moose.
开车去上班，通过崎岖的东北前寒武纪盾温尼伯，他撞上了巨大的驼鹿。
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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