A luxury is something expensive which is not necessary but which gives you pleasure.
奢侈品 • A week by the sea is a luxury they can no longer afford. 去海边一周成了一种奢侈,他们再也负担不起。
A luxury item is something expensive which is not necessary but which gives you pleasure.
奢侈的 (物品) • He could not afford luxury food on his pay. 凭他的薪水,他吃不起奢侈的食品。
live in luxury / poverty 过着奢侈/贫困的生活