of no avail

例句：

1. 1. The new policywill not be of no avail if implementedpoorly.
   如果执行不当，新政策将毫无用处。
2. 2. Despite all our efforts, theproject still remains of no avail.
   尽管我们做了所有努力，这个项目仍然毫无用处。
3. 3.The advice was of no avail to him, as he had already made his decision.
   他的建议对他来说毫无用处，因为他已经做出了决定。