SITUATION EXPLAINED: What is China trying to do to catch up in semiconductors? @perrymetzger, chairman of Alliance for the Future: "The folks at Huawei are very clever, and even though they don't have EUV fabs, they've started building three-dimensional integrated circuits." "Normal logic chips usually have all of the transistors next to each other on a flat surface. The technology for getting things crammed in closer and closer has been bottoming out. But what they've said is, well, if you…