到了1700年，弗吉尼亚州的边境已经向西远推到了瀑布线——上游河流倾泻于大西洋从而不能通航的点。
By 1700 the Virginia frontier had been pushed as far west as the fall line-the point upstream at which the rivers emptying into the Atlantic became unnavigable.
全局布线器不会把非格点引脚看成是阻挡层，这样导致你有一个过度乐观的设计结果。
The global router might not recognize off-grid pins as blocking the routing track and, as a result gives you optimistic results.
如果这是合规矩的，布线器就布线到非网格交叉点的中心。
The router only routes to the center of off-grid pin port rectangles, if this is legal.
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