What is this expression 这个表达式是什么 ; 此表达式是什么
this expression is wrong 这种表达是错误的 ; 此表达式是错误
Why this expression 为何这个表情
Why is this expression 为何这个表情
Why does this expression 为何这个表情
This expression is too funny 这表情太逗了
Should this expression 应该这样表达
This expression should be 应该这样表达
This is a colloquial expression 这是口语的表达
How did this expression get started?
这种表达是怎么开始的呢?
Well, I thought you knew this expression.
我本以为你知道这个表达方法呢。
Click there again to contract this expression.
再次单击可将表达式收缩。
You may have heard this expression: You can lead a horse to water, but you cannot make him drink.
VOA: special.2009.07.12
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。
And we can simplify this expression as saying negative e squared over 4 pi, epsilon nought r squared. Epsilon nought is a constant, it's something you might see in physics as well.
也会遇到它,在这里,你可以就把它,理解为一个转换系数,我们需要做的。
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