Strictly speaking, a particular stack is an instance not of STACK (which, as noted, is a type pattern rather than a type) but of some type generically derived from STACK, for example STACK [ACCOUNT].
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- 嚴格來(lái)說(shuō)，一個(gè)精確的棧不但是一個(gè)STACK（如上所述,這是一個(gè)類(lèi)型模式而非一個(gè)類(lèi)型）的實(shí)例而且是從STACK派生出的一些泛化類(lèi)型的實(shí)例，如STACK[ACCOUNT]。
