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。
You may charge a passenger for the use of more than one seat if the passenger's size or condition (e. g., use of a stretcher) causes him or her to occupy the space of more than one seat.
如果旅客的体型或身体状况(如使用担架)导致旅客占有1个以上座位，则承运人可以对额外占有座位收费。
You may charge a passenger for the use of more than one seat if the passenger's size or condition (e. g., use of a stretcher) causes him or her to occupy the space of more than one seat.
如果旅客的体型或身体状况(如使用担架)导致旅客占有1个以上座位，则承运人可以对额外占有座位收费。
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