There were linguistic studies support that observation.

来源: -worldance- 于 2017-12-14 18:24:01 [档案] [旧帖] [给我悄悄话] 阅读数 : (43 bytes)

本帖于 2017-12-14 23:19:35 时间, 由普通用户 -worldance- 编辑

回答: 人只可能有一个母语，即便双官方语言的国家于个人也有强弱由枫蕤甦于 2017-12-14 09:47:08

i've read somewhere yrs ago.

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