我总是忘记在句末加上标点符号。

I always forget to add the punctuation at the end of a sentence.

youdao

他的讲话文本得加上标点符号。

The transcription of his speech must be punctuated.

youdao

你得在每个句子的结尾打上标点符号。

You need to put a punctuation mark at the end of every sentence.

youdao

Now, once you know each of those, you can now do 25 more upper case letters and 25 more lower case letters then there are some other stuff like punctuation and things you see on the keyboard.

一旦你知道两者中的任何一个，你就知道了另外25个,大写字母和小写字母,标点和在键盘上的,各种符号也有ASCII码。

哈佛公开课 - 计算机科学课程节选