在语法规则中没有哪一条表明以介词结束一个句子是错误的。

There is nothing in the rules of grammar to suggest that ending a sentence with a preposition is wrong.

《柯林斯英汉双解大词典》

每场比赛结束以后，一条信息就会闪现在屏幕上。

After each game is finished, a message flashes on the screen.

《柯林斯英汉双解大词典》

这一天结束时还像开始时一样。

The day ended much as it began.

《柯林斯英汉双解大词典》

OK. Now, last thing about variables, and then we're going to start pushing on this, is where can you use them?

好，关于变量的最后一件事，然后我们就要，结束这个话题了，这个问题就是在什么地方可以应用变量？

麻省理工公开课 - 计算机科学及编程导论课程节选

Now I'd like to end -I think I have a few minutes here--I'd like to end with a particular piece.

现在我想差不多快结束了,应该还有几分钟,那就用特殊的一段曲子来结束吧

耶鲁公开课 - 聆听音乐课程节选

Well really, the things we've looked at thus far can you do after just a semester of this kind of material and exposure to this particular world.

当结束这样一门课时,你是不是能通过学习和接触计算机科学,也做出我们刚刚看到的这些东西。

哈佛公开课 - 计算机科学课程节选