[海峡指数期货] 每周一赛 - 一点海峡指数10华新币！给个例子吧！大家提意见！
weekly 太狭隘。很多future是长期的 (several months)。最好能有不限定时间的,
or extendible.
build the position, and close the position whenever i think appropriate as long as my margin requirement is fullfilled.
build the position, and close the position whenever i think appropriate as long as my margin requirement is fullfilled.
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