They get so close together they become CONTACT binaries, literally two stars touching each other.

它们靠得很近，就变成了相接双星，也就是两颗恒星相互接触。

But when the massive star swells, it gets so big the two become a contact binary.

但是当大质量恒星膨胀时，它会变得非常大，这两颗恒星会变成一对相接双星。

This is called the Algol Paradox, after the contact binary star Algol in Perseus which shows this effect.

这被称为大陵五佯谬，以英仙座的相接双星英仙座 β 星（大陵五）命名，显示了这种效应。