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In lines 1 and 2, He's saying that summer is too hot and his girl is the perfect temperate.

"And summer's lease hath all too short a date." He is explaining that summer is too short and his love is longer than the summer days.

"By chance, or nature's changing course, untrimmed;" This explains that the weather is always changing and unpredictable while she is not.

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The sunset is a good representation of what Shakespeare said "Thou art more lovely and more temperate."

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This shows that the seasons are changing and isn't as perfect as his lover.

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"So long as men can breath, or eyes can see,

So long lives this, and this gives life to thee."

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"Nor shall death brag thou wand'rest in his shade,"

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" And often is his gold complexion dimmed;"