因此我们看到氮的形式电荷是零。
So what we see is that the formal charge on the nitrogen is 0.
但现实的介入，而大部分零件都太复杂，在封闭的形式来解决。
But reality intervenes, and most parts are too complicated to solve in closed form.
疲劳破坏是机械零件和结构的常见的失效形式。
Fatigue failure is a common kind of mechanical parts and structure damage.
灰铁为农机零件常用材料，磨损是灰铁零件最常见的失效形式。
Gray cast iron is a common material for the part of the agricultural machinery.
灰铁为农机零件常用材料，磨损是灰铁零件最常见的失效形式。
Gray cast iron is a common material for the part of the agricultural machinery.
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