好听的颜色叫法:Even Einstein Had His Off Days是什么意思，求个英文专家

Even Einstein Had His Off Days是什么意思，求个英文专家 do you say ”hi” to peoplo even if they are strangers? Why or why not Albert EINSTEIN hi!!!!!!!!!!!!!!!!!!!!!!!!! More people came __ I had expected.A,as if B,like C,as if D,even if einstein的生日? Albert Einstein的资料 even是谁？ eVEN WORSE even和 even if有什么区别？