1.All communication systems serve a purpose,a pragmatic function of some sort. 所有的通信系统都有一个目的，某种实用的功能。 2.Knowledge of chronobiological patterns can have many pragmatic implications for our day-to-day ...

An individual PrM’s D-value is calculated as a quotient of the number of tokens of a PrM that fulfil discourse-pragmatic functions and the total number of occurrences in a given discourse.