1. A general digital semantic database for mechanical language translation, characterized in that all words are decomposed according to part-of-speech characteristics and semantic characteristics to form basic semantic points which cannot be further decomposed; and the basic semantic points are categorized and arranged orderly in sequence according to semantic characteristics, part-of-speech characteristics, contextual backgrounds and syntactic relationships; and two or more languages are configured at the basic semantic points according to synonym relationships; and free interchange between languages is performed by using a machine according to basic semantic points; and according to grammatical rules and commands of syntactic formulae, the machine can perform rearrangement in sequence by using semantic meanings of various languages configured in the semantic database and formulae of syntactic relationships so as to accomplish automatic translation that fits language patterns of various different languages; the general digital semantic database for mechanical language translation is “digital”, which means all basic semantic points in the semantic database are each allocated with a set of digits in order to differentiate all basic semantic points in the digital semantic database from one another; and the sets of digits are all different from one another; the sets of digits in a next level of groups are increased by 2 digits; and the first digits of all sets of digits within the same level of groups are the same but different in different levels of grows; and within the same level of groups, sets of digits in the first level are the same in their first digits and those in the second level are the same in their first two digits and those in the third level are the same in their first four digits, so and so forth; and regardless of number of levels of groups, a set of digits in any level should have its digits prior to the last two digits being the same as the set of digits from which it is expanded; and within the same level of groups, a parallel relationship is established between sets of digits which are only different in their last two digits, a subordinate relationship is established between sets of digits which are different in their first two digits and if the sets of digits are different in their first digits, they belong to different levels of groups and the relationship between them is called a cross relationship; and thus a machine digital semantic database is constituted.