【#Tech24H】The three experimental satellites of the cislunar space Distant Retrograde Orbit (DRO) precursor mission, independently deployed by the Chinese Academy of Sciences, have been conducting in-orbit tests for two years. They have achieved the world's first low-energy insertion into DRO, validating stable residency in DRO, low-energy orbital transfer, and new principles of space-based measurement, orbit determination, and navigation. The DRO precursor mission satellites have also established a K-band inter-satellite link spanning 1.17 million kilometers, becoming the world’s first spacecraft to visit all Lagrange points in cislunar space in a single mission. These satellites will play an important role in supporting future lunar exploration and related fields.