To luxuriate is to relax and really enjoy something, slowly and with your whole body or whole attention. You luxuriate in a hot bath, in the sun, in a quiet morning, in a feeling of freedom. The picture is not “buy something expensive”; it is “lie back in it and let yourself have it.” The verb is a little formal and a little bookish. Friends might just say enjoy, soak, or take my time. Luxuriate adds the idea that you are not rushing, and that the thing is rich in pleasure — even if it costs nothing, like sunshine. Though actually, you almost always luxuriate in something; you do not luxuriate a bath or luxuriate a hotel. That grammar is the part students need more than a fancy synonym list. It is a kind word, not a dirty one, in modern English: it is about comfort and pleasure, not about showing off.

盡情享受（後面常接 in）