of the force in the x direction.

若只在y方向移动。

youdao

The motion is only in the x-axis, along the x direction.

只在x轴，沿着x轴的方向进行移动。

youdao

There is no acceleration in the y direction, only in x direction when it starts moving, and that's why we split it.

在y方向上没有加速度，只有在x方向上移动时才有，这就是分解它的原因。

youdao

If two arrows are equal, you cannot be longer in the x direction and correspondingly short in the y direction.

如果要使两个矢量相等,那么即使 x 分量长一些,y 分量相应地小一些也是不行的

耶鲁公开课 - 基础物理课程节选

Unit vector i points away from the origin in the x direction.

单位矢量 i 从原点指向 x 轴正方向

耶鲁公开课 - 基础物理课程节选

I mentioned something of increasing importance only later, which is that you are free to pick another set of axes, not in the traditional x and y direction, but as an oblique direction.

后来我又讲了更重要的知识点,你可以随意选取另外一个坐标系,不再是传统的 x 和 y 方向,而是倾斜过的方向

耶鲁公开课 - 基础物理课程节选

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