Few things make you feel more helpless than sitting blank-faced at a screen, looking at a flashing cursor and a message saying "PASSWORD INCORRECT" in a disapproving tone.

面无表情地呆坐在屏幕前，盯着上面不断跳动的信息“密码错误”，很少有事情能像这样让你感觉更无助了。

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At present, since there is no effective vaccine which can prevent the cow mastitis, dairy cattle farmers in China are more helpless when confronted with the intractable mastitis.

目前国内还缺少预防奶牛乳腺炎的效果较好的疫苗，我国众多奶牛养殖户在顽固性乳腺炎面前束手无策。

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I have never felt more helpless.

我从未感到比此刻更加无助。

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Stress is more likely to be harmful if you feel helpless to deal with the problem or situation that causes the stress.

VOA: special.2009.03.24

"Fears about 'brand bullying' are much stronger in the UK. Parents seemed to feel much more helpless, " said Dr Nairn.

BBC: UK families face consumer pressure, says report

Within a few days they were broken hulks, emaciated and covered in sores, more helpless than the original camp inmates.

ECONOMIST: Tibet

As the Wolves wall jumped he drilled the ball low and hard and it scudded into the corner with the unsighted Hahnemann no more than a helpless observer.

BBC: Fulham 2-1 Wolves