进一退二法倍投法详解简介：After one stick of incense, the palace attendant came forward again and said loudly: OK, one stick of incense, the observation is over. The guards are rushing back. Please show your answers first.
After one stick of incense, the palace attendant came forward again and said loudly: OK, one stick of incense, the observation is over. The guards are rushing back. Please show your answers first.
