At the time that Einstein and Rosen produced their theoretical 'wormhole bridge' they were a relatively novel concept, but they have latterly come to form a fundamental aspect of theoretical writings on space travel.

在爱因斯坦和罗森提出“虫洞桥”理论时，它们是一个相对新颖的概念，但后来它们已成为太空旅行理论著作的基本方面。