老师，您好。在字典上看到一个句子，很是费解，请指导迷津。谢谢。

Lettie had never yet failed to return from town without some special treat for him. 莱蒂每次从城里回来都必定会给他带点特别的礼物。

上句出自《柯林斯高级英语学习词典第5版》treat词条，但我对句子的译文有些困惑。因为：

never fail to do something used for emphasizing that someone or something always does something that you expect them to do，

这样以来，句子似乎可以等价于Lettie had always returned from town without some special treat for him. 

倘如此，句子意思就是：莱蒂每次从城里回来都不会给他带点特别的礼物。