a helpless child的用法和样例：
- Julie Cayley, a 86 year-old retired schoolteacher, lifted a two ton car off of a helpless child.
- He bleated his objections in a helpless rage.
- They have got into a helpless impasse there.
- Joe looked at her in a helpless way.
- The illness left him a helpless wreck.
- Sam raised his arms in a helpless gesture.