Jessica had rapidly scanned the lines, none of which boasted a capital letter or any punctuation.

杰西卡已经迅速浏览了那几行，其中既无大写字母也无任何标点符号。

This is a capital letter.

这是一个大写字母。

A sentence must begin with a capital letter.

句子首字母要大写。

Every sentence should start with a capital letter.

每一个句子都必须以一个大写字母开始。

We need to start a sentence with a capital letter.

我们要在句子的开头用大写字母。