wastefully

例句：

1. 1.She wasted her time on unnecessary activities.
   她浪费了她的时间在不必要的活动上。
2. 2. The company's decision to invest in new technology was wastefully expensive.
   公司决定投资新技术的决定是浪费性的，代价高昂。
3. 3. We should not waste our resources when they are limited.
   当我们的资源有限时，我们不应该浪费它们。