a difference-in-differences analysis什么意思怎么翻译啊,经济学中的术语

英语翻译in diff difference-in-difference是什么意思 difference in difference estimator是什么意思 The weather in chian is___that in Japan A.difference from B.difference from C.different from make a difference to和make a difference in有什么区别? A Person Who Has Made a Difference in My Life make a difference to or in 有什么区别? I can make a big difference in this world can make a huge difference in this world Explain the difference in meaning between Sentences a) and b) 求翻译the age difference plays a part in friendship makes a difference in your life 汉语意思 英语翻译(Date changes subject to penalty plus any fare diff)请翻译下括号中的句子,plus any fare diff(difference)另补价差 全句如何理解? matlab求导,总是跳出warning,>> sym t;Xe='sqrt(800*800-430*430*(300*sin(t)-125)^2/((300*cos(t))^2-(300*sin(t)-125)^2))+430*300*cos(t)/sqrt((300*cos(t))^2+(300*sin(t)-125)^2)';diff(Xe)diff(Xe,2)Warning:The method char/diff will be removed in a fut make a difference是什么意思 make a difference make a difference是什么意思? 翻译：make a difference