表对比:but, however, nevertheless, instead, (in) contrast, in spite of this, on the one hand on the other hand, for one thing,.. for another, on the contrary 表举例: as an illustration, for example,for instance. To make it clear. . may serve as a good illustration. We may take. . as an example. a good case in point is To illustrate this point, let us consider6 • 表对比：but, however, nevertheless, instead, by (in) contrast, in spite of this, on the one hand, … on the other hand, for one thing, … for another, on the contrary • 表举例：as an illustration, for example, for instance, To make it clear,… may serve as a good illustration. We may take … as an example, A good case in point is… • To illustrate this point, let us consider…