half-year oscillation 半年振荡
year period oscillation 年周期振荡
year oscillation
年振荡
以上为机器翻译结果，长、整句建议使用 人工翻译 。
She said that this year's conditions were partly caused by a move to a negative phase of the North Atlantic Oscillation which would be likely to lead to more frequent cold, drier winters - like the 1960s - and also wetter summers for 10-20 years.
BBC: UK experiences 'weirdest' weather
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