如果页面是可调整大小的，可以从四个角的任意一个调整它的大小。
If a page is resizable, resize it from each of the four corners.
调整大小并不需要拖动对象本身，但是要拖动对象和小部件(如果有的话)的一个角。
Resizing doesn't drag the object itself, but it does drag a corner of the object as well as the resize widget, if any.
浮点数表示法，含部份换轴之高斯消去法，使用矩阵大小之计算尺度调整，带状及三角对角系统，LU分解。
Floating point representation, Gaussian elimination with partial pivoting, scaling of computations with matrix size, banded and tri-diagonal systems, LU decomposition.
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