因为大多数策略和规则会随时间变化，所以在项目中实现策略和规则很可能需要多次迭代，良好的设计方法应该适应这个现象。
Good methodologies address the fact that there will most likely be iterative attempts at implementing the policies and rules in a project as most policies and rules change over time.
现在，游戏的规则已经变，所以游戏的设计者们应该根据这种变化做了相应的调整。
Sure, the rules of our gaming have changed, but that just means the designers of our games will have to as well.
潜艇近水面运动情况下的深度及纵倾控制问题是一种非线性控制问题，潜艇自身质量及航速的变化、以及外界不规则海浪使得控制系统难于设计。
Submarine depth and rolling control near the water surface is a kind of nonlinearity control problem. The change of submarine mass, speed and ocean wave make it difficult to design of control system.
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