... work backwards 逆向操作/运算 write an equation 写等式/方程 written form of reasoning 推论的书写形式 ...
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Write an equation for the overall reaction and identify the source of each reactant.
写出一个总反应方程式并指出每种反应物的来源。
The advantage of introducing that guy is that if you like, I can now write an equation for the acceleration as a vector.
引入它的好处是,如果你愿意的话,我可以把加速度写成矢量形式
Well, the first thing you do is you write an equation.
嗯,第一点你要做的就是写一个方程。
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