相关单词近义词 voluntary 自愿的, option 选择权, natural 自然的, spontaneous 自发的，自然的，本能的..., unwitting 不知情的, unprompted 自发的, effortless 容易的, artless 单纯自然的, genuine 真诚的, willing 愿意的, unstrained 未变形的临近词Unell, UN, undepreciated currency, UN Development Program, unrivalled opportunity, uneaually speced tooth, unlicensed transmitter, unconventional warfare, uncalled-for worries, un successive training, unbalance of statistic, unfavourable prognosis相似词unflinching, unfocused, unfold, unfollow, unforeseeable, unforeseen, unforgettable, unforgivable, 返回 unforced