active and synchronized gear-shift的用法和样例：
- He was very active and rode down several horses.
- It must be the gear shift lever.
- Auto differential straight bevel gears, transmission monoblock gears and synchronizer gear rings, auto transmission middle shaft gears, CVJ inner races and so on.
- It took Amanda a long time to get used to the gear shift.
- For all his years, he was none the less active and energetic.