我是公出去上海的，不是不告而别。
它害怕的是主人会在某一个时刻逃离，与它们不告而别。
It is afraid that its master may leave without saying a word at certain moment.
在她的世界里，只有“音乐盒哥哥”是相信她的，然而他却忽然不告而别。
In her own world, the "musical box-brother" was the only person who believed in her; but he left without saying goodbye.
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