写持续爆拉的山寨的做空指标，
在爆拉之前，庄家的持仓方向肯定是多单，
1.跟随价格的上涨，合约持仓的名义价值跟持仓量保持一致持续贴合增长.
抛开最早写过的费率指标，
当庄家准备结束操盘的时候.
它会先走掉自己建立的多头仓位转换成空头仓位.
From X
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