sake

“if moving to Mars costs are, for argument’s sake, $100,000,”

为了方便讨论，前往火星的成本是10万美元，

“But other times, it makes much more sense to be doing things that are harder and less pleasant, for the sake of the big picture.”

但其他时候，为了顾全大局，做更难、更不愉快的事反而更合理。