如果因为任何原因，这些事情没有发生，祖先的种种特性也许就不会消失，从而导致返祖现象。

If for any reason this does not happen, the ancestral feature may not disappear, leading to an atavism.

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购买的产品丢失(Loss of purchases)：苹果公司的条款说“产品只能下载一次，如果因为任何原因丢失，不能够恢复。”

Loss of purchases: The terms state, "Products may be downloaded only once and cannot be replaced if lost for any reason."

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