1 英语愿意

矢量：Vector

2 英文解释

2.1 vector noun [C] (CALCULATION) PHYSICS

something physical such as a force that has size and direction

矢量；向量

2.2 vector noun [C] (ANIMAL) BIOLOGY

an insect or animal that carries a disease from one animal or plant to another

（在动物或植物之间传播疾病的）昆虫媒介，传病媒介

2.3 What is a vector?

A vector has magnitude (size) and direction:

​The length of the line shows its magnitude and the arrowhead points in the direction.

We can add two vectors by joining them head-to-tail:

​

And it doesn't matter which order we add them, we get the same result:

​Example: A plane is flying along, pointing North, but there is a wind coming from the North-West.

​The two vectors (the velocity caused by the propeller, and the velocity of the wind) result in a slightly slower ground speed heading a little East of North.

If you watched the plane from the ground it would seem to be slipping sideways a little.

​Have you ever seen that happen? Maybe you have seen birds struggling against a strong wind that seem to fly sideways. Vectors help explain that.

3 中文解释

在数学中，向量（也称为欧几里得向量、几何向量），指具有大小（magnitude）和方向的量。它可以形象化地表示为带箭头的线段。箭头所指：代表向量的方向；线段长度：代表向量的大小。与向量对应的量叫做数量（物理学中称标量），数量（或标量）只有大小，没有方向。

4 感悟体会

矢，读作shǐ，最早见于甲骨文，其本义为尾部有双羽平衡的箭只，后引申为不变线的，定向的，坚定不移的，直，正直，端正等含义。

“矢”组词：有的放矢 、众矢之的 、无的放矢，“矢”指的是有方向、有目标。