Waste not want not

例句：

1. 1. We should not waste water when we wash our hands.
   我们在洗手时不应该浪费水。
2. 2. The company wasted a lot of money on unnecessary expenses.
   这家公司在不必要的开支上浪费了很多钱。
3. 3. It's important to avoid wasting resources that could be used for something more meaningful.
   避免浪费资源是很重要的，这些资源本可以用于更有意义的事情。