all to no purpose

常见例句

He tried to find out the cause, but all to no purpose.
他試圖找出原因，但是全無結果。
They read deep and learned books to him, and then the lightest and most trifling that could be found, but all to no purpose.
人們唸些深奧的書給他聽，或唸些世上最輕松的讀物給他聽，但這對他的病也沒有什麽好処。
There he plumed and dressed himself and washed his coat, but all to no purpose, for his plumage remained as black as ever, and he himself soon perished for his usual food.
烏鴉的羽毛仍像往常一樣黑。而且，由於缺乏他賴以生存的食物，烏鴉不久後也就一命嗚呼了。
aking508.blog.163.com

But the result is an unwieldy hydra of a book that, having made its point early on, lashes out in all directions to no clear purpose.
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That is, here is a glaring waste of electric power, fully lighting a business through all its nighttime inactivity, every single night, for no purpose at all except to advertise its presence to almost empty midnight streets.
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