•a helpless two-day-old baby一个无助的两天大婴儿

•You feel so helpless because there's nothing you can do to make the child better.你觉得如此无助，是因为你没有办法使那个孩子病情好转。

•The government is helpless (to act) against these crooks.政府无法对这些骗子采取行动。