a five-speed gearbox的用法和样例：
- Easy to ride, this punchy four-stroke single has a full five speed gearbox to keep you ahead of the traffic, wherever you're going.
- Wrapped up in a five pound note.
- He said he bought those things at a five and ten.
- You don't look like a five dan in karate.
- Here's a five dollar bill,please keep the change.