than once own,我还是第一次看到，估计有误。你能否查查原句出处。另外，这两个词，在这里我会选alluring. 有的语境二者可以互换，但seductive经常和sexy 有关, 所以选alluring。请你看看答案是不是用alluring.

【1】alluring  adj. 吸引人的；迷人的 (英文解释：Someone or something that is alluring is very attractive.)  

Why are the contents of the next person's shopping trolley always more alluring than one's own?

为什么旁边人购物车里的东西看起来总是比自己车里的更诱人呢？

【2】seductive   adj.非常吸引人的;诱惑的;有魅力的(英文解释： Something that is seductive is very attractive or makes you want to do something that you would not otherwise do. )

She used her most seductive voice.她运用了自己最有魅力的嗓音。

The idea of retiring to the south of France is highly seductive.退休后到法国南方去，这个主意令人心驰神往。