a novice at swimming的用法和样例：
- He is a novice at swimming.
- Mr.Dukakis was, after all, a novice at Presidential politics.
- It needs no great sagacity to see that the writer is a novice at his task.
- Mr.Dukakis was, after all, a novice at Presidential politics. And the qualities that stood him in good stead in the primary season were far less useful in the fall campaign.