The slow development might be due to fossilization and the plateau period in writing.
这表明，在写作中也可能存在石化和高原现象。
Fossilization is a common and normal phenomenon in foreign language learning.
语言僵化是外语学习中一种常见的正常现象。
Fossilization is a common and normal phenomenon in foreign language learning.
语言僵化是外语学习中一种常见的正常现象。
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