粗糙集是研究不精确性、不确定性、不完整性现存信息或知识的数学工具。
Rough set is a mathematical approach to study imprecise, uncertain or incomplete information or knowledge.
作为交易者，你永远不会知道股票或某个市场会发怎么样波动。这就是不确定性的本质。
As a trader, you never know which stock or which market may make a move.
作为交易者，你永远不会知道股票或某个市场会发怎么样波动。这就是不确定性的本质。
As a trader, you never know which stock or which market may make a move.
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