英语翻译rt

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英语翻译
rt

S equals to half a t squared
在英国都是这么说的

S equals to one over two times a times t square
S equals to one over two times a t square

S equals one divided by two times a and t square.

S equals one half of a times t square.

这玩意儿有英语名吗,这不就是么