natural age自然年龄naturaladj.自然的；天然的；私生的natural pentaploid strawberry五倍体野生草莓natural ecological resistance自然生态阻力Natural gamma energy spectrum自然伽马能谱natural width of energy level能级自然宽度Natural Forest of Moso bamboo天然毛竹林natural-chemical capability理化性能natural radiation environment天然辐射环境natural period of oscillation固有振动周期,自然回摆周期natural ventilation potential自然通风潜力natural agglutination valence自然凝集价