It is a ubiquitous phenomenon which deserves more attention in the process of second language acquisition.

这是一种普遍存在于二语习得过程中，却被经常忽略的语言现象。

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For many years, listening has been gradually understood as an important component in the process of second language acquisition.

多年以来，听力被认为是在第二语言习得中非常重要的一个组成部分。

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Moreover, this phenomenon of morphological variability seems to be persistent in the whole process of second language acquisition (L2A).

而且，这种现象会在整个二语习得过程中持续出现。

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