Really in example sentence
In the last year, 2010, two car companies started, one that's in the U.K. called WhipCar, and the other one, RelayRides, in the U.S. They're both peer-to-peer car-sharing services, because the two things that really work for car-sharing is, one, the car has to be available, and two, it's within one or two blocks of where you stand.