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。
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。
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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