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1·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。《柯林斯英汉双解大词典》

2·This is a capital letter.

这是一个大写字母。

3·A sentence must begin with a capital letter.

句子首字母要大写。

4·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。

5·We need to start a sentence with a capital letter.

我们要在句子的开头用大写字母。

6·A capital letter is not the first letter in a word.

大写字母不是单词的第一个字母。

7·Your password must have at least one capital letter.

你的密码必须至少有一个大写字母。

8·What is the first capital letter of your English name?

你英文名字的第一个大写字母是什么？

9·A capital letter is used to begin a sentence or the name of a person or place.

在句子、人名或地名的开头，要用大写字母。

10·Then the next sentence starts with a capital letter of the first word of the sentence.

下一个句子开头的第一个单词的第一个字母要大写。