球場上的那塊地方
字面的用法，也是另外兩個說法的來源。先看得懂這塊場地，後面的比喻才會自己站起來。
noun · B1
In baseball, the far part of the field on the left side as you look out from home plate, and also the fielding job of the player who stands there.
左外野
核心畫面
Stand at home plate on a baseball field and look out. The far left corner of the grass is a long way off, and the fielder standing there is the one you are least likely to be watching. Two things follow from that one picture: a ball can arrive from there before you see it coming, and a person standing there is far away from everybody else.
可以想成你站在本壘往外看。左邊最遠的那塊草地離你很遠，守在那裡的人也是你最不會盯著看的人。這一個畫面長出兩件事：球從…更多收起
可以想成你站在本壘往外看。左邊最遠的那塊草地離你很遠，守在那裡的人也是你最不會盯著看的人。這一個畫面長出兩件事：球從那裡飛過來，你往往來不及反應；而站在那裡的人，離其他所有人都很遠。棒球的用法是實景，另外兩個說法是把這個實景借去講人和事。Two branches
借來講意外與離群
同一塊場地，兩個角度。看「球從那裡飛來」，講的是事情來得突然；看「人站在那裡」，講的是想法離大家很遠。介系詞就是分界線：out of 對前者，out in 對後者。
noun · B2
If something comes out of left field or from left field, it is completely unexpected and seems to arrive from nowhere.
突如其來