他无助地看着母亲痛苦地死去。He watched helplessly as his mother died an agonizing death.即使最强壮的游泳者也会无助地被交叉水流冲走。Cross-currents can sweep the strongest swimmer helplessly away.他们又冷又饿, 无助地漂向北极.Cold and hungry, they drifted helplessly towa...