相關(guān)單詞近義詞 voluntary 自願的, option 選擇權(quán), natural 自然的, spontaneous 自發(fā)的，自然的，本能的..., unwitting 不知情的, unprompted 自發(fā)的, effortless 容易的, artless 單純自然的, genuine 真誠的, willing 願意的, unstrained 未變形的臨近詞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相似詞unflinching, unfocused, unfold, unfollow, unforeseeable, unforeseen, unforgettable, unforgivable, 返回 unforced