we are sure that mystery will be fully explained some day by human beings( )( )( )( )the mystery will be fully explaint some day ……

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we are sure that mystery will be fully explained some day by human beings( )( )( )( )the mystery will be fully explaint some day ……

we are sure that mystery will be fully explained some day by human beings( )( )( )( )the mystery will be fully explaint some day ……
we are sure that mystery will be fully explained some day by human beings
( )( )( )( )the mystery will be fully explaint some day ……

we are sure that mystery will be fully explained some day by human beings( )( )( )( )the mystery will be fully explaint some day ……
不能说it is sure that...,要说也只能说It is certain that...,但是都把原句的we的含义给漏掉了.
所以最好改成:
1.We are certain that...
2.We make sure/certain that...

It is sure that
it is certain that 毫无疑问……;肯定……