玩家在RAID副本中能连续奋战数小时。 研究人员估计，魔兽玩家每周玩游戏的时间平均约为25至40个小时。

Players can spend hours at a time on "raids", with researchers estimating that the average Warcraft player spends around 25 to 40 hours per week playing the game.

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在此参数表示下，模糊数可直接视为二维度量空间r 2中的有界连续曲线，这给分析模糊微分方程带来了便利。

By the parametric representation, fuzzy number means a bounded continuous curve in the two-dimensional metric space R2, so that it is easy to analyze fuzzy differential equations.

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