In the second article, I added an Airline class, shown in Listing 2, to the mix to demonstrate a simple 1: m relationship.
在第二篇文章中，我添加了一个airline类(如清单2所示)，以演示一个简单的1：m关系。
Going back to the trip planner now, let's revisit the domain model and see if any m: m relationships are lurking around. In the first article, I created a trip class, shown in Listing 1.
现在回到trip - planner应用程序，首先回顾一下域模型，并查看有没有潜在的m： m关系。
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