In second language acquisition, learners often replace foreign and unfamiliar sounds in the second language with the ones available in their first language. These replacements are obviously not random; however, what determines how learners replace foreign sounds? The present study is interested to find out the rules governing these replacements, particularly by analyzing common replacements in five target languages and by comparing the articulatory features between the original foreign sounds and the replacing sounds; and see if the occurrence frequency of the phonemes available in the first language would affect the results of these replacements.

衡陽市簡介 衡陽市為湖南省所屬地級市，位於湖南省中南部，湘江中游。地處東經110º32¹16″-113º16¹32″,北緯26º07¹05″-27º27¹24″。東鄰株洲、攸縣、安仁；南界永興、桂陽；西接冷水灘、祁陽、東安、邵陽、邵東；北靠雙峰、湘潭。南北長150 公里、東西寬173 公里。全市面積15,310 平方米，總人口718.95 萬，以漢族為主，另外還有回族、滿族、蒙古族等少數民族。 衡陽因位於衡山之南而得名，其一直為湖南南部之交通輸紐及政治、經濟與文化中心。衡陽於秦時屬長沙郡，自隋朝起稱衡州。清代康熙17 年吳三桂起兵反清，隨後在衡州府稱帝，改國號為周，易名為定天府。至中華民國以後，1914年設衡陽道，1922 年撤銷道制，1937 年成立第五區，1943 年設為省轄市。

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