One way to hold this word: a battle shrunk down to a size you can run safely. There are two sides, a set of rules, a start and an end — everything a battle has except a real enemy. Because it is only a model, you can stop it, look at what went wrong, and run it again. That is why English calls it a game even when the people doing it are entirely serious.
可以想成：把一場戰爭縮小到你能安全跑一遍的大小。有兩方、有規則、有開始和結束，該有的都有，只少了真正的敵人。因為只是模型，所以可以喊停、看哪裡出錯、再跑一次。英文之所以用 game 這個字，重點不在好玩，而在「照規則進行、可以重來」。順著這個畫面看，這個詞的幾個用法就連起來了：軍隊拿它測計畫，玩家拿它在桌上較量，動詞則是「拿某個計畫去跑一遍」。
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