名词
中文翻译：长期变化
同义词：
['long-term change', 'long-term fluctuation例句：1. The weather has been quite unpredictable lately', 'with long-period variations in temperature and rainfall.（最近天气很不预测，温度和降雨量都有长期的波动。）2. The stock market experienced a long-period variation in its performance this year.（今年股市的表现经历了一次长期的波动。）']
例句：
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1. The weather has been quite unpredictable lately, with long-period variations in temperature and rainfall.
最近天气很不预测，温度和降雨量都有长期的波动。
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2. The stock market experienced a long-period variation in its performance this year.
今年股市的表现经历了一次长期的波动。
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3.The scientists observed that the ocean's temperature had undergone a long-period variation due to global warming.
科学家们观察到，由于全球变暖，海洋的温度经历了一次长期的波动。