Forbidden-love stories are uTOPian by nature, especially in contrast with the mundane constraints of marriage and family. A prime characteristic of thisliminaluniverse—and the key to its irresistible power—is that it is unattainable. Affairs are by definition precarious, elusive, and ambiguous. The indeterminacy, the uncertainty, the not knowing when we’ll see each other again—feelings we would never tolerate in our primary relationship—become kindling for anticipation in a hidden romance.
问题：
请问liminal的意思是？thisliminaluniverse如何翻译？
liminal 为心理学术语，形容词，意为：处于意识边缘的，勉强能感觉到的。
universe 在此为”范围、范围“的意思。
由指示代词this修饰 liminal universe 可知，this liminal universe （这个处于意识边缘的范围）指的就是前面提到的forbidden love—被禁锢的爱。
A prime characteristic of thisliminaluniverse—and the key to its irresistible power—is that it is unattainable
这个处于意识边缘的范围—被禁锢的爱—的主要特点（与它不可抗拒的力量的重点）就是它是很难得到的。
