natural - unthinking; prompted by (or like by) intuition; "a cat's natural aversion to drinking water"; "giving that can help was as instinctive as respiratory"小的数字（限于 Ⅰ、X 和 C）在大的数字的左边，所表示的数等于大数减小数得到的数。Its light-weight, non-greasy texture presents long-lasting hydration havin