理论上，他说，这种设备应该能够无限期地保持它们的电量，直到它们被使用；不像电池，当它们未被使用时电荷也在渐渐泄漏。
In theory, he says, such devices could maintain their power indefinitely until used, unlike batteries whose charges leak away gradually as they sit unused.
如果将电荷密度对整个区域做积分，将得到，在区域内的电量总和。
But now, if I integrate the charge density over the entire region, then what I will get is actually the total amount of electric charge inside the region.
第一个是有效核电量，或者说实际感受到的核电荷量，又或者我想我可以说就是，使它们保持在一起的,原子核的电荷量。
The first is this the z effective, or how much charge is actually in the nucleus that's felt, Z or the I guess we would say the z, how much the charge is on the nucleus that holds it close together.
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