They were speeding the mail so that it didn't have to wait to sort it before it went on the train-- it was sorted while it was moving on the train.
发信速度很快,以致于在上火车之前不再需要,等着分类整理-,可以边坐火车边整理。
Similarly, if you're dealing with immature humans and you want your child to get you a beer, you can't just sit, wait for the kid to give you a beer and uncap the bottle " and say, "Excellent. Good. Hugs."
类似的,如果你要训练的是未成年人,如果你想让你的孩子帮你拿一罐啤酒,你就不能只是坐着,等孩子把啤酒拿给你,然后你打开瓶盖,说,“太棒了,来抱一下“
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