a parachute drop的用法和样例：
- A parachute, such as one for pilots or skydivers.
- Needing someone is like needing a parachute.
- To descend by means of a parachute.
- A parachute,such as one for pilots or skydivers.
- I would never dare (to) jump with a parachute.
- To drop(supplies or troops,for example) by means of a parachute.