但是，在某些时间或空间，一些物种会迅速生长到足以造成危害的数量，导致病虫害爆发，持续时间不定。
However, sporadically, in time or space, some species may grow rapidly to damaging numbers, developing outbreaks which may persist for a variable length of time before subsiding.
所有项目不仅提供紧急援助，还帮助各国制定病虫害治理战略，以防止中长期内进一步爆发森林病虫害。
All projects offer more than emergency assistance, helping countries also to develop pest management strategies to prevent further outbreaks in the medium and long term.
该系统甚至还被用于预测疟疾等病虫害的爆发。
It even allows it to forecast outbreaks of insect-borne diseases such as malaria.
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