part of speech 为什么翻译成“词性”?

part of speech 为什么翻译成“词性”? 英文part of speech 英文Part of speech. Part of speech-thx part of speech中的part是什么意思 part of speech of it什么意思? What part of speech is "than"? be part of 中part是什么词性 翻译成中文……Good afternoon,everyone!The topic of my speech today Only man has the power of speech,and all men have it.翻译成中文 中国公民不会因为Freedom of speech而受到处罚.翻译成英文 “Sex is part of nature.I go along with nature” 　翻译成中文.