La Nina is a natural 3-6-year cycle, and the cold stretch of a periodic thermal oscillation in ocean surface temperatures that occurs throughout the tropical Pacific.

拉尼娜每隔3到6年发生一次，太平洋热带地区海水温度会随之发生周期性的异常变冷。

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PTA prices downward trend after the lunar New Year as a whole to maintain oscillation, while during the rebound, but the lack of bright spots.

PTA价格在春节后整体保持振荡下行态势，期间虽有所反弹，但表现缺乏亮点。

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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