fifteen

fifteen的音标是[ˌfɪfˈtiːn]，基本翻译是十五。速记技巧是可以用字母组合fi代替发音/fi:/。

fifteen这个词的词源可以追溯到古英语中的词汇“fīftan”，意为“十五”。它的变化形式主要有复数形式“fifteens”，过去式和过去分词形式“fifteen”，现在分词形式“fifteening”。

相关单词：

“fourteen”意为“十四”，与“fifteen”相对，词源相同。

“fiftieth”意为“第五十”，词形变化规则相同，表示序数词的第五十个。

“fifth”意为“第五”，是基数词，表示数量。

“fifthly”是副词，意为“第五地”，词形变化规则为“-ly”，与“fifth”相关。

“fiftieths”是一个短语，意为“五十个中的一部分或全部”，其中包含了基数词和序数词的组合。

这些单词在英语中广泛使用，具有丰富的含义和用法。fifteen作为基数词和序数词的结合，表示数量和顺序，在英语中具有重要的作用。同时，它的变化形式也反映了英语单词的多样性和灵活性。

常用短语：

1. fifteen years old

2. fifteen minutes walk

3. fifteen to sixteen

4. for fifteen days

5. at fifteen

6. fifteen to one

7. fifteen to two

例句：

1. He is fifteen years old and already taller than most of his classmates.

2. It takes me about fifteen minutes to walk to school.

3. We have been friends for fifteen years.

4. She had a vacation for fifteen days in the mountains.

5. At fifteen, she knew she wanted to be a doctor.

6. It was fifteen to six when we left the cinema.

7. There are fifteen to twenty students in each class.

英文小作文：

Today I am fifteen years old, and I feel so excited about the future ahead of me. I am looking forward to what the next decade will bring, filled with opportunities and challenges that will help me grow and become a better person. I am also looking back at the past ten years and realizing how much I have learned and how far I have come. I am grateful for all the experiences that have shaped me into the person I am today, and I am excited to see what the future holds for me and my family.