Analyze and comment on the following.Analyze the three causes of meaning change within the scope of the linguistic factors, based on the given words below.（1）gold, bulb;（2）deer, beast, animals;（3）fortuitous, fruition.
（1）INTERNAL FACTORS: SUCH CHANGE OCCURS WHEN A PHRASE IS SHORTENED TO ONE WORD WHICH RETAINS THE MEANING OF THE WHOLE, E.G. GOLD IS USED FOR 'GOLD MEDAL', AND BULB FOR 'LIGHT BULB'.
（2）THE INFLUX OF BORROWINGS: SUCH CHANGE OCCURS WHEN THE BORROWINGS ARE INTRODUCED INTO ENGLISH VOCABULARY. FOR INSTANCE, DEER FORMERLY MEANT ANIMAL, AND LATER ANIMAL FROM LATIN AND BEAST FROM FRENCH FOUND THEIR WAY INTO ENGLISH. AS THE THREE TERMS WERE SYNONYMOUS, ANIMAL RETAINED THE ORIGINAL MEANING, THE MEANING OF DEER WAS NARROWED AND BEAST CHANGED IN COLOUR. 
（3）ANALOGY: SUCH CHANGE OCCURS WHEN ANALOGY IS USED. FOR INSTANCE, FORTUITOUS FORMERLY DENOTED 'HAPPENING BY CHANCE', 'ACCIDENTAL' AND LATER TOOK ON THE MEANING 'FORTUNATE' PROBABLY BY ANALOGY BECAUSE THE TWO WORDS LOOK SIMILAR. IT IS THE SAME WITH FRUITION. THE ORIGINAL MEANING BEING' A PLEASURE OBTAINED FROM USING OR POSSESSING SOMETHING', WHICH HAD NOTHING TO DO WITH FRUIT. ITS MEANING OF 'THE BEARING OF FRUIT' WAS DUE TO THE LATER ASSOCIATION WITH THE WORD FRUIT. 
