It was a vain effort.
这种努力是徒劳无益的。
You're knocking your head against a brick wall.
你在做徒劳无益的事。
That effort will be bootless.
那种努力将是无益的。
It is profitless to continue arguing .
继续争论是无益的。
a barren argument
无结果的争论，无益的争论
A useless life is an early death. -- Wolfgang Von Goethe
无益的一生与夭折无异。——歌德
Would he argue with useless words, with speeches that have no value?
他岂可用无益的话、无济于事的言语理论呢。
"Will he make arguments with words in which is no profit, and with sayings which have no value?"
他岂可用无益的话，和无济于事的言语，理论呢?
Should he reason with unprofitable talk? or with speeches wherewith he can do no good?
3他岂可用无益的话，和无济于事的言语，理论呢。
All his efforts were without avail.
他的所有努力都是徒劳无益的。
Don't clog your memory with useless facts.
你不要在你的记忆中堆满无益的事实。
cry over spilled milk
"为打翻的牛奶流泪,做无益的后悔"
"I lost my job. Oh well, it's no use crying over spilt milk."
我失去我的工作噢!后悔是无益的。
Unprofitable eloquence is like the cypress, which is great and tall, but bears no fruit.
无益的雄辩犹如高大的柏树，不会结果。
There's no use crying over spilt milk.
无法挽回的事哭也无益。
There is no wisdom in useless and hopeless sorrow.
在无益和无望的悲哀中绝无智慧可言。
All his wealth did not profit him.
他所有的财富于他无益。
a company with a poor track record
一向无效益的公司.