Concentric folding preserves the thickness of each bed as measured perpendicular to original bedding.

同心褶皱保持各岩层的厚度与在原始层理垂直的方向上所测得的相等。

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Lie on the bed and lift your leg at the Angle of 45 degree, then bent your knees slowly and then return to the original position. Repeat this move for 100 times.

平躺在床上，提起腿到45角位置，再慢慢地弯曲膝盖，然后恢复到最初的平躺状态，这样是1轮，重复这个运动100次。

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As a final touch, a young woman leaps into the bed, joining the original sleeper.

作为最后的联系，一名年轻女子飞跃到床上，加入原始卧铺。

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"That led to the idea that one could give most or all of the radiation closer to the original tumor bed and that would solve the problem, " says George Sledge, a past president of the American Society of Clinical Oncology and co-director of the breast-cancer program at Indiana University Simon Cancer Center, in Indianapolis.

WSJ: New Scrutiny for Popular Breast-Cancer Treatment

Craning our necks to see the front of our train nose out of a tunnel as the back of it enters, down below we spot the Trans-Canada Highway, laid on top of the original Big Hill track bed.

BBC: The wonders of Canada by rail