It began in April of nineteen ninety-four after a plane carrying the presidents of Rwanda and Burundi, both Hutus,was shot down.

VOA: special.2009.03.09

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

Um-hmm. So, it's going to be the y z nodal plane, or in other words, we can say it's any place where phi is equal to 90 degrees.

嗯，是ｙｚ平面，换句话说，是在phi等于９０度的面。

麻省理工公开课 - 化学原理课程节选

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

Then, I gave you one other very important example of a particle moving in the x-y plane.

下面我再拿一个重要的例子,质点在 x-y 平面内的运动

耶鲁公开课 - 基础物理课程节选

The pilot spent fifty hours in a simulator -- a copy of the plane on the ground -- preparing for his ten-minute flight.

VOA: special.2010.07.07

Our picture now is going to be some particle that's traveling in the x-y plane.

我们现在的情景是在 x-y 平面内,运动的质点

耶鲁公开课 - 基础物理课程节选

In nineteen-ninety seven, John Denver was killed when the plane he was piloting crashed.

VOA: special.2009.07.10

And that's the following. Let's take a particle that is moving in the x-y plane, so that at one instance-- sorry, let me change this graph-- is here--oh, this is bad.

接下来,我们来看一个物体,在 x-y 平面内运动,在这个例子中,对不起,我要重画一下这个图,在这里,这画得不好

耶鲁公开课 - 基础物理课程节选

In April,1994 unknown assassins shot down the plane carrying then-President Juvenal Habyarimana.

VOA: standard.2009.04.10

Abdel Basset al-Megrahi received a warm welcome from flag waving Libyan supporters as he stepped off the plane Thursday in Tripoli, after his release from custody in Scotland on compassionate grounds.

VOA: standard.2009.08.21

As state television cameras chronicled his exploits for the Tuesday evening news, he co-piloted an amphibious firefighting plane, taking on water from a river and dumping it on burning fires in the Ryazan Region.

VOA: standard.2010.08.10