...ng for X intercity through train, please go westward to the entry and exit hall for inspection X方向 X Direction X站欢迎您 Welcome to X Railway Station ..
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It can be x plus some change in x plus j times y plus a change in y.
可以写成 x 加上 x 方向的变化量,再加上 y 加上 y 方向的变化量
If you go to another neighboring country, that's what they think is naturally x and y.
如果你们到了另一个相邻的国家,这就成了他们所惯用的 x 和 y 方向
This equation is telling you if you compress it, namely if x is negative, F will be then positive, because it's pushing you outwards.
这个方程告诉我们,如果压缩弹簧,即令 x 为负,F 就为正,因为推力的方向向外
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