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。
In the nature, arsenic is one of the wide distribution toxic trace element and carcinogen.
砷是一种具有毒性且分布相当广泛的微量元素之一,并且已被认定为是致癌物质之一。
In the nature, arsenic is one of the wide distribution toxic trace element and carcinogen.
砷是一种具有毒性且分布相当广泛的微量元素之一,并且已被认定为是致癌物质之一。
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