On December 17 at 15:40, Binance BTC is currently reported at 86,800 USD, with a slight increase of 0.6% during the day, in a high-level pullback adjustment period. Key support is at 85,000-86,000 USD, strong support at 80,000 USD, and resistance at 89,000-90,500 USD. The daily RSI is approximately 43 and biased towards bearish, with ongoing selling pressure in perpetual contracts, increasing the competition between long and short positions. The focus should be on short-term observation, and if there is a breakout, follow the trend for trading. (109 characters)
