The images of 9/11 are seared into our national memory — hijacked planes cutting through a cloudless September sky;

11的每一个画面已经深深烙进了这个国家的记忆当中-被劫持的飞机划破无云晴朗的9月天空；

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Well, that's the same thing as cutting, I mean, we slice the graph by horizontal planes.

这跟切割是同样的，我们用水平面切割图像。

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The geometric shape and the height of the four blades, the width of front cutting edges and a relative position between the planes composed of the front of the blades are provided with own features.

四块刀片的几何形状、高度、前切削刃的宽度以及刀片前面所组成的平面之间的相对位置等独具特点。

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Some aviation safety experts have questioned whether FAA has the in-house expertise to oversee the safety of cutting-edge technologies that haven't been in planes before.

NPR: FAA Approves Resumption Of Boeing 787 Flights