Why, for instance, do water users in a megacity like Lagos not pay an extra charge to get cesspits pumped out?
例如,为何不让像拉各斯这样大城市的用水者交纳些额外费用以资助抽粪出坑呢?
Spin any electric charge and you get a magnetic field.
当你把任意电荷旋转起来,就能得到磁场。
So hopefully next time we do a formal charge question, we'll get everyone back up to speed.
希望我们下一次做关于形式电荷的问题的时候,大家能够做得快一点。
Customers who went to a doctor would get their next haircut free of charge.
VOA: special.2010.10.27
So, when we get really close together, granted, there is a net positive negative charge with a Coulombic force of attraction.
当它们真正离得很近时,假设有一个带正负电的电荷,带有库仑引力。
So hopefully next time we do a formal charge question, we'll get everyone back up to speed.
希望我们下一次做关于形式电荷的问题的时候,大家能够做得快一点。
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