But it turns out that technologies like airplanes, which were developed in the last century, have become integral parts of medicine.

但像飞机这样,在上世纪发展起来的技术,确实已经成为医学不可分割的一部分

耶鲁公开课 - 生物医学工程探索课程节选

The plane crashes exactly on the border of Canada and the United States.

飞机刚好,在加拿大和美国的边界上坠毁

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When you have a velocity in the moving plane frame and you want to find the velocity on the ground, you should add to every object in the plane the velocity of the plane with respect to the ground.

当你在运动的飞机上运动,然后你想找到相对于地面的速度,你就应该给每个物体加上,飞机相对于地面的速度

耶鲁公开课 - 基础物理课程节选