As mentioned above, in an upward trend, wait for the price to rebound to an important support level to buy, and stop losing after effectively breaking the level. Short term selling and closing positions on the upper track of the upward channel(But it's easy not to open new positions and sell short);在下跌的趋势中等待价格反弹到重要的压力位上抛空,有效破位止损。同样,在下降通道的下轨处买进平仓(Never open new positions to rebound);