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1·His name starts with the letter d.

他的名字以字母 d 开头。youdao

2·In this word, the d is pronounced clearly.

在这个单词里，d 发音很清晰。youdao

3·When I see the letter d, I think of dogs.

我看到 d 这个字母就想到了狗。youdao

4·There is a card with the letter d on it.

这里有一张写着 d 的卡片。youdao

5·The letter d is the fourth one in the alphabet.

d 在字母表中是第四个字母。youdao

6·The child is learning to write the letter d.

孩子正在学写 d 这个字母。youdao

7·There is a big d on this sign.

这个标志上有个大大的 d。youdao

8·I like the shape of the letter d.

我喜欢 d 这个字母的形状。youdao

9·The letter d often appears in many words.

d 常常出现在很多单词里。youdao

10·The teacher pointed at the d and asked the students to read it.

老师指着 d 让学生读。youdao

(1)vitamin D维生素D（抗佝偻病维生素）；钙化醇

(1)big D大D城

(1)r anD Dabbr. 研究发展（Research and Development）

(1)D minor[音]d小调