You use evidently to show that you think something is true or have been told something is true, but that you are not sure, because you do not have enough information or proof.
From childhood, he was evidently at once rebellious and precocious.
他从小就明显地又叛逆又早熟。
You can use evidently to introduce a statement or opinion and to emphasize that you feel that it is true or correct.
Evidently, it has nothing to do with social background.
显然,这与社会背景毫无关系。