An event data represents a unique combination of type, situation, and condition.
事件数据表示唯一的类型、情况和条件的组合。
S - Size up the situation, surroundings, physical condition, equipment.
估量周边局势,环境,身体状况,装备。
So it's a sufficient condition for an argument being valid that there is no possible situation where the premises are true and the conclusion false. And that's a necessary condition too.
所以这对于论点有效性是充分条件,没有可能前提为真,结论为假,这是必要条件。
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