Double over the edge before sewing.

在缝纫时先把边折过来。

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For example, when the cursor passes over a window's frame, the cursor changes to a double-ended arrow showing the axis in which the window edge can be stretched.

比如，当光标通过一个窗口的边框时。光标就会变成两端都是箭头的形状。

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Numerical investigation of the effects of different leading-edge profiles on vortical flows over a double-delta wing;

计算模型包括尖前缘、菱形前缘、圆形前缘等三种不同前缘形状的机翼。

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Instead Obama got 1.3% economic growth rates, the economy teetering on the edge of a double dip, an unemployment rate over 9%, and shrill claims from the hard left that mere near trillion dollar deficits simply are not enough.

FORBES: Not Default, Growth: Wall Street, Main Street And Even Washington Gets It Now

Despite Romney's double-digit edge over his nearest competitors, and the seemingly two-way Democratic battle between Clinton and Obama, Holland said Granite State victories are still up for grabs.

CNN: Poll: Obama catches Clinton in New Hampshire