language is descriptive ,not prescriptive

lean/6 sigma A descriptive statistic which is not a measure to learn a foreign language is not This book is for the students____native language is not Engl If English is not your primary language, indicate the number "This file in your language is not yet available. French is not an easy language to learn. 英语翻译Language is not an abstract construction of the learned To mast a language is not an easy thing. This file in your language is not yet available. These books are for studends __native language is not Englis This flle in your language .is not yet available descriptive是什么意思