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Nostalgia History gt; History of P LE passenger service In aussiehinz's thread about Pittsburgh Lake Erie Railroad U-Boats, one of the posters (bailey) asked about passenger service on the P LE Rather than diverge off the topic of P LE U-Boats, I am starting a new thread on the subject of P LE passenger service The 125th anniversary of passenger service is coming on February 24
“了”字是怎么发展出 le 跟 liǎo 两个读音的？ - 知乎 现代汉语“了”（le）的常见用法有两个，一般称为“了₁”和“了₂”，如“他吃了饭了”中前一个是“了₁”，后一个是“了₂”（两个“了”的作用和区别请有需要者自行搜索，本回答不作介绍）。 两个“了”今天读 le 都是来自 liao 轻声的元音弱化，而 liao 显然是来自“了”（liǎo）的完结义