topic type的用法和样例：
例句
- He had never met this type of question before and was suddenly baffled.
他从未见过这种题型，一下子懵了。 - Finally, a set of suggestions were proposed to enhance the positive backwash and carry out further study on this question type.
最后，通过这些分析与调查，本文对如何促进改错题的积极反拨作用和进一步研究此类题型提出了一系列建议。
