Cross-currents can sweep the strongest swimmer helplessly away.

即使最强壮的游泳者也会无助地被交叉水流冲走。

《柯林斯英汉双解大词典》

Bonner watched helplessly as they drove away without him.

邦纳无助地看着他们开着车扬长而去，留他一人。

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"I can't either," cried Pinocchio; and his laughter turned to tears as he stumbled about helplessly.

“我也不能了。”皮诺乔叫道。当他无助地跌跌撞撞时，他的笑声变成了眼泪。

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West Germans could but watch helplessly as his body was pulled from the water.

FORBES: A Development In Berlin Threatens The Wall That Once Divided A Continent

For nearly three days Oberoi stayed put there, communicating by cell phone, watching helplessly from afar.

FORBES: Magazine Article

She watched helplessly as her husband drifted off clasping the plastic cover of their Jacuzzi.

FORBES: Magazine Article