to little/no purpose

• 徒劳无益的

to little/no purpose的用法和样例：

例句

1. It's no use praying for the weather to change.
   祈求天气变化是徒劳无益的。
2. Roosevelt was reluctant to undertake the thankless task.
   罗斯福不大愿意承担这种徒劳无益的任务。