1、An appulse of two stars in the binary system occurs when they come closest together in their orbit.
在双星系统中，当两颗星体在它们的轨道上最接近时，发生了一次相交。
2、In astronomy, an appulse refers to the passage of one celestial body in front of or behind another, as seen from Earth.
在天文学中，相交指的是从地球上看，一个天体在另一个天体的前面或后面经过的情况。