一至二十序数词用英语怎么说_一至二十序数词英文怎么写

Ordinals from one to twenty

二十序───Twenty Preface;数词───numeral

Preface mainly focuses on parsing of the thesis title "Twenty years 'history of TV public service advertising in China".───导言”主要对本论文标题“中国电视公益广告二十年”进行了解析。