Three short-selling signals under a bearish structure, the core is to wait for rebound confirmation, not to short blindly.

1. Previous high resistance level: When the price rebounds and touches the previous high, a stagnation in growth or a volume reversal is the first signal to enter. At this point, the market attempts to counterattack but fails, and the bears organize their defense here.

2. Second rebound confirmation: After a decline, if there is another rebound but it fails to break through the previous high, forming a clear 'low not broken, high lower'. This rebound usually occurs on reduced volume, representing the second shorting opportunity under the structure.

3. Previous low breakdown confirmation: When the previous low point is effectively broken, the trend is further confirmed, waiting for a minor retracement, this is the last confirmation signal for a trend-following short. At this time, trading leans towards being cautious, with clear and definite stop-loss points.

The trend structure is symmetric; how to short in a bearish structure is the same as how to go long in a bullish structure. The only difference is the direction, while the logic remains the same.