布鲁斯·佩伦斯把这个说成是软件采购成瘾模型。
Bruce Perens calls this the addiction model of software procurement.
佩伦说：“地表覆盖物可能经历过大规模的变化，致使火星变成了目前的地形。”
"There could have been a massive change in the distribution of mantle," Perron said, "which would have caused the planet to shift into its current position."
佩伦和他的同事们还不能确定是什么引起了火星的倾斜，但他们认为这是地表以下的力量所致。
Perron and his colleagues aren't certain what caused the toppling of the planet, but they think forces beneath the surface are to blame.
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