This phenomenon was neither due to the barrier of language, nor due to different personalities.
这种现象既不是因为语言障碍，也不是因为不同的个性所致。
Fossilization is a universal phenomenon in language development and a huge barrier for successful language learning.
石化现象普遍存在于外语学习中并一直是学习者的巨大障碍。
An inner reverse barrier is simulated with the I-V curves, as shows that the negative resistance phenomenon is caused by the break down of the reverse barrier.
模拟分析表明，一种反向势垒的存在及其击穿，应是引起负阻现象的原因。
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