The Panel itself has x and y coordinates.

Panel 本身具有 x 和 y 坐标。

youdao

Suppose A itself is the unit vector in the y direction B Then A dot B is what?

假设A是y方向上的,单位矢量,则是z方向上的单位矢量。，and，B，is，the，unit，vector，in，the，z，direction。,那A点B是多少呢？

youdao

That element is itself a list, so the second indexing ([y]) returns one of the nested list's elements.

该元素本身也是一个列表，因此第二个索引操作([y])返回嵌套列表的元素之一。

youdao

At every instant, it's got a location given by the vector R; R itself is contained in a pair of numbers, x and y, and they vary with time.

在每一个瞬时,它的位置由位矢 R 给出,R 本身包含了一对坐标值 x 和 y,并且它们都随着时间的变化而变化

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