The partial or total use of the child's home language when the child enters school, and a later change to the use of the school language only.
即，学生进入学校以后部分或全部使用母语，然后逐步转变为只使用第二语言进行教学。
The use of the child ' s home language when the child enters school but later a gradual change to the use of the school language for teaching some subjects and the home language for teaching others.
学生刚进入学校时使用母语教学，然后逐渐地使用第二语言进行部分学科的教学，有的学科仍使用母语教学。
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