每天给自己设置一个合适的目标，当你觉得没什么问题的时候，再逐渐增加难度。
Set yourself some realistic goals each day, then gradually increase their difficulty as you get more comfortable.
限制：快速、可靠地区别敌人、中立、友军或者目标——比如平民、扭、树、拖拉机——有难度。
Limitations: Difficulty of quickly and reliably discriminating between hostile forces and neutral or friendly parties or objects, such as civilians, cows, trees, and tractors.
当然，微软的宣传目标比较容易达到(相对苹果来说)，但要想弄出个能和Google分庭抗礼的广告，恐怕还是有难度。
There, of course, Microsoft had a relatively easy target (Apple) - but it would really be hard to construct an AD that attacks Google's search prowess.
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