What this tells you is E In particular,if you have an empty region of space or a region 0 where nothing has electrical charge then E has divergence equal to zero.

这个告诉你们的是,的散度由电荷的存在引起的，that，divergence，of，E，is，caused，by，the，presence，of，electric，charge。,一个真空区域，或没有电荷的区域,那么E的散度等于。

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Many landlords charge too much rentals for much profit. And because of such intention his property may remain empty for months.

许多房东收取多利润而要价太多租金。而且由于有这样的企图，他的产业可能会保持数月的空屋。

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To investigate the parameters of parallel cut blast without empty holes, an advanced numerical method is used to study the explosion effect of charge in hole perpendicular to a free surface.

为了考查无空孔直眼掏槽爆破参数，采用数值模拟方法研究单自由面垂直炮孔的爆炸作用问题。

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Some local authorities have already announced plans to not just scrap the council tax discount on second homes and empty properties, but to charge double the standard rate on those properties instead.

BBC: Council Tax Benefit change 'to create poll tax Mk II'

And its a charge that is as empty of truth as it has been frequent.

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It has also voted to cut council tax concessions for empty homes and bring in a 150% charge for properties left vacant for two years or more.

BBC: Derelict house