Between Problem

当孩子/学生遇到"第 a 和第 b 之间有几个/几层/几站"这类题时调用; 出现 "之间" "排第几和第几之间" "中间有几个" "between" 等信号时调用。用途是讲清"之间不含两端"并用画图法计数。 也用于辨析易混的"从第 X 到第 Y"(含两端)题。不适用于: 直接算加减、比大小。 trigger: 之间 / 中间有几人 几层 几站 / 不含两端 / between how many

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