This photo shows smoke generators at work, providing visual feedback to researchers about airflow over the X-Plane.

这张照片显示了在工作烟雾发生器，提供视觉反馈，不要过度的X -平面气流研究员。

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"First flight of a Navy unmanned X-plane — that's a huge deal, but it's just one of the many firsts to come out of this program," Engdahl said.

Engdahl还说“这是海军无人验证机的第一次飞行，这可是大事儿，但仍然仅仅是这一项目的开始而已”。

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Objective To evaluate the feasibility and accuracy of real-time three-dimensional echocardiography (RT-3DE) full volume and X-plane for quantifying the volume of left ventricular (LV) models.

目的探讨实时三维超声心动图（RT-3DE）全容积成像及双平面法测量左心室容积的可行性和准确性。

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The first plane ever to fly faster than the speed of sound was the X-1 in nineteen forty-seven.

VOA: special.2010.07.07

Another way to represent a point in a plane is I've got a radius and I've got an angle from the x-axis, right, and that's a standard thing you might do.

平面上面的点的方法,也就是极坐标,上面那种方法其实是，如果你们喜欢我这么说的话,笛卡尔坐标表示法。

麻省理工公开课 - 计算机科学及编程导论课程节选

So, it's the x-y plane, you can see there's no electron density anywhere there.

它在ｘｙ平面，你们可以看到在这里没有电子密度。

麻省理工公开课 - 化学原理课程节选

The agency has already spent billions of dollars on the National Aerospace Plane, the X-33, X-34, X-37, X-38 and the Orbital Space Plane.

FORBES: Magazine Article

Latest example of NASA bloated spending: The agency has already spent billions of dollars on the National Aerospace Plane, the X-33, X-34, X-37, X-38 and the Orbital Space Plane.

FORBES: Magazine Article

He flew the X-15 rocket plane to the edge of space - 200, 000 feet up at 4, 000 mph.

MSN: First man on moon Neil Armstrong dead at 82