他们构建了一个基于主体的模型，在这个模型中，每个主体的财富根据它与邻居互动的方式而变化。
They have created an agent-based model in which each agent’s “wealth” evolves according to the way it interacts with its neighbours.
邻居的孩子来呆了一会儿，看看鲍勃的最新火箭模型。
The neighbour boy run in for a minute to see Bob's newest model rocket.
自由飞模型一般都很袖珍，容易储存，也容易在小场地飞行而不会打扰邻居。
Free flight scale models tend to be a handy size - easy to store at home, and capable of flying on small fields without disturbing the neighbours.
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