Excerpts from an unknown source. They summarize the progress and history of various electromagnetic launcher projects. The tidbits reveal that China has been working on the technology since at least 2007, when it formed a R&D group on EM launching technology (which I assume is headed by Mr. Ma). By 2016, the group's EM catapult had prevailed over steam catapult in a competition. The same group is also responsible for underwater EM launchers (presumably for submarines), a certain long-range EM launcher (railgun?), and others. The group is also currently working on an EM satellite launcher (?).
Please help with the technical translation, as my Chinese is limited.