Cosine curve is a simple model indicating the periodicphenomenon.
余弦曲线是周期现象的简单模型。
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To some extent we're seeing the results of a natural phenomenon, La Nina - a periodic event in which water in the equatorial Pacific becomes cooler than normal.
To some extent we’re seeing the results of a natural phenomenon, La Ni?a — a periodic event in which water in the equatorial Pacific becomes cooler than normal.