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useless

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Astronauts will make a final attempt today to rescue a communications satellite from its useless orbit.(宇航员们今天将做最后一次尝试，把一颗通讯卫星从它无用的轨道上拯救出来。)
It's useless to fire away with such trivial details.(喋喋不休地谈这些琐碎细节是无用的。)
The red rose often looked at the cactus and said bad words about it, like "This plant is useless."(红玫瑰经常看着仙人掌说一些坏话，比如“这植物没用。”)
I soon became aware that campaigning is useless.(我很快意识到竞选是无用的。)
The camel's feet, well adapted for dry sand, are useless on mud.(骆驼的脚十分适合干旱沙地，但在泥地上毫无用处。)
It is useless for you to tempt me!(你诱惑我是没有用的！)
You may see yourself as useless, incompetent and blameworthy.(你也许会认为自己无用、能力差、应该受到指责。)
For those in power, this makes history as a discipline not only useless but dangerous too.(对于掌权者而言，这使得历史作为一门学科不仅毫无用处，而且危险。)
She knew it was useless to protest.(她知道抗议是没用的。)
Their education system is useless.(他们的教育制度一点儿也不好。)

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