The element sulfur as a main product prevented acidification of the biological fixed bed, which maintained the stability of the operation.
元素硫作为主要产物防止了生物固定床的酸化，并保证脱硫装置的稳定性。
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。
The distribution of element in soil profile was related to the characteristics of elements, soil parent, topography, climate and intensity of geological leaching and biological accumulation.
各元素在土壤剖面中分布状况与元素特性、母质，地形、气候以及地质淋溶和生物积累强弱有关。
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