For a watermark, the highest or lowest value reached, up to the end of the most recent 15-minute interval.

对于水位标志，直到最后15分钟时间间隔期间所达到的最高或最低值。

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Results showed that corrosion potential moved negatively till the lowest value was reached and kept stable during the procedure of copper crevice corrosion.

结果表明，铜发生缝隙腐蚀的过程中，金属腐蚀电位朝负移动，至一最低值并保持不变。

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