第二，我们知道每个牌局都有一些未知的变数。
Second, we know that in gambling a number of unknown variables act on the outcome of each game.
每个图表第二列中的名称，都对应于宣告中的变数名称。
The name in the second row of each figure corresponds to the name of a variable in the declaration.
生活充满了变数。前一天你还有一间公寓，第二天你发现它就变成了饺子馆。
Life is full of changes. One day you have an apartment, the next day it's a house of dumplings.
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