surdity

例句：

1. 1. The old house is a source of no surdity to anyone.
   这所老房子对任何人都没有价值。
2. 2.He realized the importance of his work and felt a sense of surdity in his life.
   他意识到工作的重要性，并在生活中感到了无价值。
3. 3. Surdity can be a double-edged sword; it can bring both joy and despair.
   无用性可以是一把双刃剑；它可以带来快乐和绝望。