 The Chinese Space Agency is designing a sample retrieval mission from Ceres that would take place during the 2020s . 
 The Chinese Space Agency is designing a sample retrieval mission from Ceres <a href='null_relcl' title='1'><mark>that</mark></a>would take place during the 2020s . 
Da Chinese Space Agency is designing a sample retrieval mission from Ceres would take place durin the 2020s .