描述
这是一个使用简单，却有效的操作系统。
系统中包含了四条线，进场线、进场线2、出场线、出场线2。
使用上就是当空手要建部位时，看两条进场线，
在两条线的下方布空，在两条线的上方布多，一上一下则自行斟酌。
而当手上有部位时，则看两条出场线，有跌破任一条时就可以考虑出场。
This is a simple to use, but effective trading system.
There are four lines included in the system, entry line, entry line 2, exit line, exit line 2.
When you have no any position, look at the two entry lines.
Under the two lines builds short position, above the two lines builds long position, one above and one under takes no action.
When you have position in your hand, look at the two exit lines, and if it break out either one, you can consider exit.
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