双币套利2.0版本，适合于套利，稳定。。。(2 version of double currency arbitrage, suitable for arbitrage and stability)

原理很简单，当两个货币对的价差放大或缩小的时候一边做多一边做空，等两边价格运动到一定差价时，会盈利，这就是双货币套利。(The principle is very simple. When the price difference between two pairs of currencies is enlarged or narrowed, the two pairs of currencies will make profits w