1. A machine translating system comprising: a dictionary of a first language for storing word units of said first language and pivot words representative of said word units; a dictionary of a second language for keeping word units of said second language and pivot words representative of said second language word units, common pivot words stored in said first language dictionary; a pragmatic table for storing pairs of pivot words and those pragmatic data for each pivot word pair which define a semantic relationship between the pivot words of the pivot word pair in at least three languages which comprise a pivot language and said first and said second languages, said pivot language serving as a pivot on carrying out translation between those of said at least three languages which do not include said pivot language; analyzing means for analyzing a first string of word units of one of said first and said second languages, which is selected as a source language with the other of said first and said second languages used as a target language, by referring to the dictionary of said source language and to said pragmatic table to provide selected pivot words in compliance with the first string word units and to produce a source semantic structure by said selected pivot words and by said selected pivot words and by semantic relationships which are allowed by the pragmatic data in said source language and have features of said source language; standardizing means for standardizing said semantic structure by referring to said pragmatic table to provide a pivot representation by using the pivot words of said semantic structure and by semantic relationships which are allowed by the pragmatic data in said pivot language and are free from the features of said source language; wording means for wording said pivot representation by referring to said pragmatic table to provide a target semantic structure by using the pivot words of said pivot representation and by semantic relationships which are allowed by the pragmatic data in said pivot language and comply with wording of said target language; and translating means for translating said target semantic structure by referring to the dictionary of said target language and to said pragmatic table to provide a second string of selected word units which are selected from the word units of said target language to represent the pivot words of said target semantic structure, said second string being allowed by the pragmatic data in said target language.