In the active structural acoustic control based on radiation modes, the cancellation of the dominant radiation modes and determination of the arrangement of secondary forces are of virtual important.
Soil water plays the dominant role on soil respiration in re-vegetated desert area, while temperature and the type and phrase of plant community are secondary.
在沙漠人工植被区，影响土壤呼吸的主要因子是水分，其次是温度与植物群落类型和发育阶段。
3
Reservoir study shows there have been primary and secondary reserving pores developed in the volcanic rock reservoirs of this area, the secondary pore being dominant.