莎士比亚的第十八首十四行诗（Sonnet 18）是一首赞美爱情的诗歌，它以夏日为比喻，表达了对爱人美丽和永恒之美的颂扬。下面是这首诗的全文：
```
Shall I compare thee to a summer's day？
Thou art more lovely and more temperate:
Rough winds do shake the darling buds of May,
And summer's lease hath all too short a date:
Sometime too hot the eye of heaven shines,
And often is his gold complexion dimmed；
And every fair from fair sometime declines,
By chance, or nature's changing course, untrimmed；
But thy eternal summer shall not fade,
Nor lose possession of that fair thou ow'st,
Nor shall Death brag thou wander'st in his shade,
When in eternal lines to time thou grow'st.
So long as men can breathe or eyes can see,
So long lives this, and this gives life to thee.
```
这首诗通过对比夏日的短暂和易逝，以及爱人美丽的不朽，传达出诗人对爱人深沉而持久的爱慕之情。诗中运用了丰富的比喻和修辞手法，如将爱人的眼睛比作太阳，表达了她明亮耀眼的美。
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