然而，公司仍然必须有一笔庞大的现金流围堰使企业保持生存。
However, a company must still have a huge coffer of money for cash flow to keep the business alive.
有时，它把蛋隐匿在冰冷的地面下以应对未来运气不好的日子。在这种艰苦的环境中，保持生存意味着要像狐狸一样聪明。
Some, he stashes in the cold ground for the lean days ahead. In this harsh environment, staying alive means being as clever as a fox.
研究人员说：这些位点必须保持不变，才能保证病毒正常生存和复制。
Researchers believe these sites must remain unchanged for the virus to survive and replicate properly.
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