Picture the minute hand on a clock. It has just clicked forward, and the thing you are holding has clicked forward with it. Nothing has happened since. That is the whole word: caught up with the clock, with no gap left between now and what you have.
可以想成時鐘的分針剛剛跳了一格。你手上的東西也跟著跳到同一格。中間沒有落差，也沒有漏掉的事。這個字說的就是這件事：跟時鐘追平了。因為是跟時鐘追平，所以它會過期。九點追平的東西，十點就不一定還追得上。追平的是什麼，決定了它的兩個用法：追平的可以是消息，也可以是款式。
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