Understanding the Modal Adverb "白白"

The Chinese modal adverb "白白" (bái bái) is used to express a sense of waste or futility, indicating that something has been done in vain or without purpose. It often conveys regret or disappointment over a loss or an unnecessary action.

In the examples provided:

1. 她忘了关水龙头，白白浪费了很多水。
   Translation: "She forgot to turn off the faucet, wasting a lot of water for no reason."
   Here, "白白" emphasizes that the water was wasted unnecessarily due to her forgetfulness.

2. 这次投资失败了，让公司白白损失了很多钱。
   Translation: "This investment failed, causing the company to lose a lot of money for no reason."
   In this case, "白白" highlights the futility of the investment, stressing that the loss was avoidable.

Overall, "白白" serves to underscore the idea that the action taken led to an undesirable outcome without any benefit, often evoking a sense of regret.