"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”。

youdao

For this reason, the paper put forward a comparable method that transforms all of them to R-X plane.

为此提出了将两者都归算到R - X阻抗圆平面上比较的方法。

youdao

Through check, it is found that minimum excitation limit is calculated in P-Q plane, while impedance type loss-of-field protection is analyzed in R-X plane.

“发电厂并网运行安全性评价”要求验证低磁励限制与失磁保护的整定关系，在实际校核中，发现低磁励限制是在P-Q平面进行计算的，而阻抗型失磁保护是在R-X阻抗圆平面进行分析的。

youdao

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