1) A good case in point is ...

　　2) As an illustration, we may take ...

　　3) Such examples might be given easily.

　　4) ...is often cited as an example.

　　二、证明

　　1) No one can deny the fact that ...

　　2) The idea is hardly supported by facts.

　　3) Unfortunately, none of the available data shows ...

　　4) Recent studies indicate that ...

　　5) There is sufficient evidence to show that ...

　　6) According to statistics proved by ..., it can be seen that ...