进一退二投注法的例子简介：The scales of the mermaid, which contains magic power, can be used as magic props before the magic power is exhausted, but after the magic power is exhausted, it can only be used as a medium for casting spells.
The scales of the mermaid, which contains magic power, can be used as magic props before the magic power is exhausted, but after the magic power is exhausted, it can only be used as a medium for casting spells.
