即使在感染你的时候，感冒病毒也会发生变异，而且新的病毒毒株经常出现，以至于当制药商研制出针对其中一种变异的疫苗时，血清已经过时了。
Colds mutate even while they're infecting you, and new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.
“如果乒乓球已经没人用，过时了，你会怎么推销兵乓球呢？列出多个方法，然后从中挑出一个，并详细描述。”
"How would you market ping pong balls if ping pong itself became obsolete?" List many ways, then pick one and go into detail.
至少了解两到三种 语言，所以，如果某种语言过时了，你在学习新技术的时候还可以依靠另一种语言。
Know at least two or three languages, so if one dies off, you have another one to fall back on while you train for a new technology.
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