原级：moped
1. The plan will also ensure that cyclists are free from the menace of aggressive mopeds and motorbikes.
2. People ambling on the sidewalks would also be happier if they didn't have to worry all the time about bikes and mopeds mowing them down.
3. They go to school by motorcycles or mopeds, instead of buffalo or elephants.
4. " Mopeds more than eight years old produce even more pollution and cause more accidents, " said Cai.