U.S. stocks will eliminate both short selling and going long; if you’re not holding long-term, increasing trading frequency is very likely to get you trapped. But since the A-share market has no inherent ability to short, it can only trap those who go long. For example, today, A shares only rose a little at the open and immediately trapped a bunch of retail investors. Yesterday I randomly opened a short position—intending to use a Martingale strategy for the short—but before it even started, it was already profitable.