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每个表达式返回一系列的值，这些值又可以作为其他表达式的输入。
Each expression returns a list of values that can be used as input to other expressions.
每个表达式仅根据其操作数来返回值，并且都不会产生副作用。
Each expression returns a value that depends only on the operands of the expression, and no expression has any side effects.
另外还需要注意，Root是泛型的(实际上每个表达式都是泛型的)。
Also notice that Root is generically typed. (Actually, every expression is.)
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