"I do not find it invasive," "Our security is important to me, and the security of the other people that are on the plane,"

VOA: standard.2009.12.30

And in the plane there is some other object.

在平面上有一个物体

耶鲁公开课 - 基础物理课程节选

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

Besides the presidential couple, all other people on board the plane reportedly died, including the country's army chief, its deputy foreign minister, the Central Bank governor and scores of other officials, legislators and crew members.

VOA: standard.2010.04.10

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