it公式
原声例句
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So we can now take this expression and rewrite it under the condition of du is equal to zero.
我们利用这个公式,并在du=0的条件下将它重写。
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I could write some mathematics to try and-- but I think it's so simple and obvious.
我也可以写些公式来讲,但我觉得已经够清晰明了了
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If it equals zero, then we're at equilibrium.
如果公式等于零，那么系统就处于平衡态。
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