Frame、environment、binding 这些东西的定义就在前一章： https://mitpress.mit.edu/sicp/full-text/sicp/book/node55.html An environment is a sequence of frames. Each frame is a table (possibly empty) of bindings, which associate variable names with their corresponding values. (A single frame may contain at most one binding for any variable.) Each frame also has a pointer to its enclosing environment, unless, for the purposes of this discussion, the frame is considered to be global. The value of a variable with respect to an environment is the value given by the binding of the variable in the first frame in the environment that contains a binding for that variable. If no frame in the sequence specifies a binding for the variable, then the variable is said to be unbound in the environment. -- Sent from my HR-93. --

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