当浸泡一段时间后，薄层油膜的电位开始随时间变化发生负移。
With increasing of immersion time, when the potential of thin oil film reached most positive value, it began to shift negatively.
当浸泡一段时间后，薄层油膜的电位开始随时间变化发生负移。
With increasing of immersion time, when the potential of thin oil film reached most positive value, it began to shift negatively.
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