One way to hold this word: draw a long line between two points and then ask what has to cross it. If a person or a vehicle crosses it, you get the runner, the bus, the flight. If a voice crosses it, you get the phone call. If two people stand at the ends and cannot cross it often, you get the relationship. The line is the same in all three; what changes is who or what is trying to get over it.
可以想成先在兩點之間畫一條很長的線，再問一句：是誰要跨過去？如果跨過去的是人或車，就是 long-distance runner、long-distance bus、long-distance flight。如果跨過去的是聲音，就是 long-distance call。如果兩個人站在線的兩端，很難常常跨過去，那就是 long-distance relationship。線都是同一條，換的只是要過線的東西。
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