twentynum.二十Twenty minutes ago.20分钟前。twenty-twenty visionn.〈医〉正常视力twenty-first century21世纪Twenty-one inches.二十一英寸。twenty four hour orbit二十四小时轨道twenty-four preludes24首前奏曲twenty four hours shift二十四小时轮班制Twenty tablets in it.二十粒。twenty-high roll mill二十辊冷轧机twenty-four hour meal二十四小时钡餐