来自付振宪的问题
英语语言学的问题,判断对错Ifsegmentsappearinthesamepositionbutthemutualsubstitutiondoesnotresultinchangeofmeaning,theyaresaidtobeinfreevariation.
英语语言学的问题,判断对错
Ifsegmentsappearinthesamepositionbutthemutualsubstitutiondoesnotresultinchangeofmeaning,theyaresaidtobeinfreevariation.

