natural fat奶含有天然脂肪,天然脂肪naturaladj.自然的；天然的；私生的natural siliceous sand天然石英砂natural gas air mixing天然气／空气混合natural flake graphite天然鳞片石墨Natural gas occurrence天然气藏natural air-crossing天然风桥natural grounding body自然接地体natural rate of growth[经] 正常增松率natural drought stress干旱胁迫natural productiveness自然生产力Natural Forest Project天保工程