已讀不回：left the message (on) read
I haven't heard anything back from Janice. She just left my messages (on) read.
我好久沒收到Janice的消息了。她都已讀不回我。
不讀不回：left the message unread
I think Tom is super busy. All of the messages I sent to him yesterday are still unread.
我想Tom真的是超忙的。我昨天傳給他的訊息都不讀不圖。
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