The flourishing of the Jehol Biota is related to the unique, warm, fresh water and continental environment of East Asia in the Early Cretaceous.
热 河生物群的繁盛和东亚地区当时特有的温暖的淡水和陆地环境具有密切的联系。
The study of the Jehol Biota has a long way to go, while the scientific administration and protection of the fossil sites remains a pressing issue.
热河生物群的研究还具有很大的潜力，而对化石的科学发掘和保护的任务还十分艰巨。
Excavation and trace element analysis indicates: Jehol biota experienced mass mortality and rapid burial; toxic gases of the volcanic activities are the main factors of biological catastrophic event.
化石发掘和微量元素分析表明，热河生物群经历了集群死亡和快速掩埋，火山活动的有毒气体是生物灾难事件的主要因素。
Excavation and trace element analysis indicates: Jehol biota experienced mass mortality and rapid burial; toxic gases of the volcanic activities are the main factors of biological catastrophic event.
化石发掘和微量元素分析表明，热河生物群经历了集群死亡和快速掩埋，火山活动的有毒气体是生物灾难事件的主要因素。
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