1. 自然状态：naturalized 驯化的 | naturalness 自然状态 | nature 天性

2. 自然;逼真度：naturally fractured reservoir 天然裂缝性储层 | naturalness 自然;逼真度 | nature assemblage 自然群集

noun

1. the likeness of a representation to the thing represented

    e.g. engineers strove to increase the naturalness of recorded music

2. the quality of being natural or based on natural principles

    e.g. he accepted the naturalness of death
           the spontaneous naturalness of his manner

3. the quality of innocent naivete

    Synonym: artlessnessinnocenceingenuousness