For example, people who park in a clean public garage are significantly less likely to litter than if they park in the same garage on a day when it is dirty with litter.

• 例如，在一个干净的公共车库中泊车的人们乱丢垃圾的现象会显著性地比在某天同一个车库由于乱丢垃圾很脏的时候要少。