NOEC无可见影响浓度noadv.不adj.没有；不是；禁止n.否定的回答；投反对票者No food and drink allow不准携带食物或饮品no roof over one's headNo Easy Walk to Freedom走向自由并不容易no decompression diving不减压潜水No ransom has been paid从没支付赎金no -bell furnace roof无料钟炉顶nociceptive information伤害性信息no-tillage with mulch免耕覆盖NO ENTRY WITHOUT A PASS无通行证不得入内No need artificial idea不着意见