1 2020-12-18 01:03:30Xinhua Editor : Wang Fan ECNS App Download Professor Yung Kai-leung (L2) tests the "Surface Sampling and Packing System" for moon surface sampling with his team members at a lab of the Hong Kong Polytechnic University (PolyU) on Dec. 17, 2020. (Xinhua/Li Gang) The Hong Kong Polytechnic University (PolyU) research team, which developed one of the key systems for China's first lunar sample return mission, has done more than 1,000 times of simulation to help complete the sampling, the team leader said on Thursday. The return capsule of Chang'e-5 probe touched down on Earth early Thursday, bringing back China's first samples collected from the moon.