The optimization of the system of categories is essential to the optimization of ways of thinking.

优化哲学范畴系统对优化思维方式具有重要意义。

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Notice that the system used one of the existing categories rather than adding the new one.

注意，系统使用的是一个现有的类别而不是添加一个新类别。

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Once these rules are in place, your system will simply discard any packets that fall into one of these categories.

一旦这些规则就位，系统就只废弃任何属于其中一个类别的信息包。

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The whole system essentially consists of three categories of plays: (1) Tebow gives the ball to a running back, (2) Tebow pretends to give the ball to a running back and throws it instead or (3) Tebow pretends to give the ball to a running back and then runs it himself.

WSJ: Waiting for Tim Tebow to Go

So the power dynamics underpinning the political system make all of the spending categories relevant to military modernization vulnerable to cuts in a defense downturn, even though Secretary Gates and his subordinates insist it is essential to maintain robust spending in those areas.

FORBES: How Politics Will Shape The Defense Downturn

And the regulators invented the Basel system of risk-weighted capital ratios, which stipulates different leverage ratios for different categories of loan, in theory to take account of the riskiness of those loans.

BBC: If banks are treated as naughty kids...