He demonstrated the art . he folded , unfolded and refolded . he explained the intricate details , the need for sharp creases 他向人们示范着这门艺术- -折好，拆开，再折好，并向人们解释复杂的细节以及必须把折皱处弄得平滑光洁、有棱有角。
2.
On a typical modern digital pcb assembly , for example , the parts are all squat rectangular components , and the traces are laid out with a precision only a computer could love 例如，在一块标准的数字印刷电路板上，所有的器件都是有棱有角的，布线的精度也只有计算机才可以完成。
3.
He was surprised when the typed ones began to come back . his jaw seemed to become squarer , his chin more aggressive , and he bundled the manuscripts off to new editors 以前的稿件一退给他，他也立即打好送出，可他打好的稿件仍然给退了回来的时候他吃惊了，腮帮子似乎更有棱有角了，下巴似乎更咄咄逼人了。
4.
The thousand roofs , dense , angular , clinging to each other , composed , nearly all , of the same geometrical element , offered , when viewed from above , the aspect of a crystallization of the same substance 那成千上万的屋顶密密麻麻，有棱有角，粘附紧贴，几乎都是由一几何原理构成的，俯瞰之下，呈现出同一物质的晶体状态。
