类型化语言(typed language): 变量都被给定类型的 语言 语言 无类型语言(untyped language): 语言不限制变量值的 范围，即没有类型或者仅有一个包含所有值的泛类型 Yu Zhang, USTC Yu Zhang, USTC 程序设计语言理论-引言 ...
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到现在为止，您一直在使用Lisp作为一种大型的无类型语言。
Up to now, you've been using Lisp as a largely typeless language.
为了帮助解答演讲的具体问题，我们将影响发言的无文字行为分为三大类型：肢体语言、眼神交流、面部表情。
To help answer specific questions about presenting a speech, we will consider three major categories of nonverbal behavior that affect delivery: body language, eye contact, facial expression.
语言类型的标记关系是影响第二语言习得顺序的一个重要因素，学习者往往首先习得无标记的语言项目，然后才习得有标记的项目。
Recent studies show that markedness is an essential factor determining the order of second language acquisition, and that learners tend to acquire unmarked language items before marked ones.
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