白费

My sister is much self-will, it is waste of time to try to change her mind.

我妹妹很固执，你要她改变心意根本就是白费力气。

My sister is so self-will that it is impossible for you to change her mind.

我妹妹很固执，你要她改变心意根本就是白费力气。

My sister is very self-will,it is a waster of time to change her mind for you .

我妹妹很固执，你要她改变心意根本就是白费力气。

My sister is so self-will that it is waste your power to change her mind.

我妹妹很固执，你要她改变心意根本就是白费力气。

My sister is very self-will, It is wasting time to make her change her opinion.

我妹妹很固执，你要她改变心意根本就是白费力气。

My younger sister is very self-will,it's just waste of time if you want to change her mind.

我妹妹很固执，你要她改变心意根本就是白费力气。

We set all the traps have been in vain.

我们设下的所有圈套都白费了。

You could ask him, but I think you are just spinning your wheels.

你可以问他，但我觉得你是在白费力气。

Stowe tried every means to pull his business through, but all in vain.

斯托千方百计想使他的企业免于失败，但白费力气。

L don't want you to strike out tomorrow.

我不想你明天又白费力气。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。