And they use a completely different methodology that involves -- after the crash occurs, they get from the insurance companies the names of the people who were in the crash, and they call them on the phone, and they asked them what happened.
这篇论文用了非常不同的实验手段，包括 — 在车祸发生后，他们从保险公司那里得到了 车祸中牵连的人的名字， 他们给这些人打了电话， 详细问了事情发生的经过。