... 不知道的父亲 unknown father 不知道的损失 amissum quod nescitur non amittur 不知道的女性用品 wsj ...
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我们不知道我们的太阳在过去的40亿年里损失了多少质量。
We don't know for sure how much mass our Sun's lost over the last four billion years.
而与此同时，虽然有数百万人在关注动植物及其栖息地遭到的灾难性损失，却不知道如何提供援助。
Meanwhile, millions of people who care about the catastrophic loss of wildlife and habitats aren't sure how to help.
我也不知道为什么要拿劳动力的流失量来衡量制造能力的损失。
I'm also not sure why one would measure lost manufacturing capacity in terms of lost workers.
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