First, the complexity of classes increases tremendously when you start writing magic methods.

首先，在刚开始编写魔法方法时，类的复杂性显著增加。

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First, there is the complexity of the genetic process.

首先，遗传的过程极其复杂。

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The first, titled “Today: Complexity”, shows many boxes linked by arrows.

第一个图表，题为“复杂的今天”，图上有许多由箭头链接的方框。

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He says a new system is needed to meet the speed and complexity of a twenty-first century global economy.

VOA: special.2009.06.19

The first had to do with the complexity of the legislation.

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The first skill is the ability to deal with complexity: To not see the world in black and white but to perceive the full palette of colors that make up the current situation.

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The latest incarnation, SimCity 4, must satisfy two markets, with enough of the new and improved for crusty old veterans, without boosting its complexity beyond the reach of first-timers like myself.

BBC: Screenshot from SimCity 4 courtesy of EA Games