Yeah, to intentionally make the files unrecoverable.

这是有意地让文件不可修复。

From the reading passage, a sunk cost is described as an unrecoverable spent sum.

在文章中，沉没成本被描述为不可挽回的花费。

Done properly, files scrambled by ransomware are unrecoverable unless you pay the hackers for a long alphanumeric key.

如果处理得当，被勒索软件加密的文件将无法恢复，除非您向黑客支付长字母数字密钥。

Since then, our existential risk— risk of either extinction or the unrecoverable collapse of human civilization— has steadily increased.

从那时起，我们的生存风险——灭绝或人类文明无法恢复的崩溃的风险——一直在稳步增加。

Like nuclear war, climate change could result in a lot of terrible scenarios that we should be working hard to avoid, but that would stop short of causing extinction or unrecoverable collapse.

就像核战争一样，气候变化可能导致许多我们应该努力避免的可怕情景，但这不会导致灭绝或无法恢复的崩溃。