a pair of stars that orbit (= follow a curved path around) each other, or one of a pair of stars like this

Like other binary stars, the two appear to be bound by gravity, orbiting around each other. 像其他联星一样，这两颗恒星似乎被引力约束，相互围绕着对方运转。

Hooke discovered in 1664 that Gamma Arietis was a binary star. 胡克在1664年发现白羊座5是一颗联星。