由500人参加的问卷调查能真正代表所有民众吗？

Is a questionnaire answered by 500 people truly representative of the population as a whole?

《牛津词典》

在毕业典礼上，我代表所有毕业生发表了感言。

On the graduation ceremony, I represented all the graduates to give a speech.

youdao

所报告的数字将代表所有文件中的所有行。

The reported number will represent all lines in all files.

youdao

And the poetry that he stands for the fisherman stands for like all of Yeats's poetry is a poetry again of symbols.

这首诗代表了,渔夫代表了,和叶芝所有的诗一样,这是关于象征的诗。

耶鲁公开课 - 现代诗歌课程节选

So here's how well off you are, here is time, and you start with nothing and you end up incredibly well off.

纵坐标代表你的处境，横坐标代表时间，你从一无所有到辉煌腾达。

耶鲁公开课 - 死亡课程节选

since all the information is in the current price, you don't have to worry about whether it went up or down yesterday, to decide what it's going to do today.

因为当前价格代表了所有信息，你就不需要去考虑昨天股价,是涨了还是跌了，再去判断它今天的价格会怎么变化。

麻省理工公开课 - 计算机科学及编程导论课程节选