◎ 数往知来 shǔwǎng-zhīlái
[deduce what likely to happen in the future by reviewing what has taken place in the past;know the future by thinking of the past] 追溯过去,可以预测未来
【解释】数：计算；往：过去；来：未来。明了过去，可以推知未来。
【出处】《易·说卦》：“数往者顺，知来者逆。”
【语法】联合式；作谓语、定语；指知道前事，可以推知未来