Teaching a foreign language by means of mother tongue is a very popular practice which can be found in L2 teaching and learning at home and abroad. Yet, the disadvantage of this approach overweighs its advantage. There are two reasons: subjective factors and objective ones. The most effective way to solve this problem is to upgrade the teachers'professional qualities.%用母语来教授外语这是国内外二语教学的一个普遍存在的教学模式。其弊大于利,其产生的原因有主客观两个方面。解决的主要办法是教师专业素养的提高。
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