| 释义 |
〔background〕Sound or radiation present at a relatively constant low level at a specific location.背景音乐，基底：在某个特定的位置以一个相对稳定的低水平表现出来的声音或传播〔subclimax〕A stage in the ecological succession of a plant or animal community immediately preceding a climax, and often persisting because of the effects of fire, flood, or other conditions.亚顶级群落：一植物或动物群落中直接先于气候顶极或区域顶极的生态演替阶段或群落，常因为火灾，洪水或其他条件之影响保持相对稳定〔airglow〕A low- or middle-latitude, more or less steady, faint photochemical luminescence in the upper atmosphere.气辉：大气层上部位于低纬或中纬的相对稳定的微弱光化冷光 |