natural range meaning in English

自然分布范围
自然分布区

There is a natural range in size in the breed
有是一个很自然的范围大小，在滋生。
A flexible joint is one in which the muscles and connective tissues surrounding it do not restrict the natural range of movement
所谓灵活的关节，是指关节周围的肌肉及结缔组织不会限制自然的动作幅度。
Standard test methods for determining the biobased content of natural range materials using radiocarbon and isotope ratio mass spectrometry analysis
使用放射性碳和同位素比率质谱分析法测定天然材料中生物基含量的标准试验方法