虽然我们现在知道金属导体中的电流是由负电荷引起的，但我们将遵循通用的惯例，即把电流看作是正电荷的单纯的流动。

Although we now know that current in metallic conductors is due to negatively charged electrons, we will follow the universally accepted convention that current is the net flow of positive charges.

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然而使网页变得复杂已经是一种通用的惯例了，电子商务网站已经采取一种“散射”的方法旨在提供给所有潜在购买者尽可能多的选择。

However, it's become a common practice to do just the opposite. e-commerce sites have taken this "scatter shot" approach of trying to slap the potential buyer with as many options as possible.

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注意：向单元类型添加属性是可能的，但是按照惯例，所有的通用属性都位于功能而不是单元之中。

Note: it is possible to add attributes to the unit type, but by convention, all custom attributes are placed on capabilities rather than on units.

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