natural
adj. /ˈnætʃrəl/ A2
天然的；自然的
Existing in or caused by nature; not artificial.
仙境例句
The King liked the white roses because their colour was natural, but he never told the Queen.
国王喜欢白玫瑰，因为那是天然的颜色，可他从不敢告诉王后。
原著这一句
The first question of course was, how to get dry again: they had a consultation about this, and after a few minutes it seemed quite natural to Alice to find herself talking familiarly with them, as if she had known them all her life.
第一个问题自然是怎么把身子弄干：大家对此商量了一番，几分钟后，爱丽丝便觉得和它们熟络地交谈是再自然不过的事了，仿佛自己一辈子都认识它们似的。
卡罗尔原著 · 第 3 章