A watermelon is red inside and green outside.

西瓜内红外绿。

《新英汉大辞典》

Peach is pink, And watermelon is red.

桃子是粉红色的，西瓜是红色的。

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I like to eat a variety of fruits, such as watermelon, peaches, strawberries, but my favorite is apple, because apple is my favorite color is red, and sweet apple flavors, very tasty.

我喜欢吃很多种水果，比如说西瓜桃子草莓，但我最喜欢的还是苹果，因为苹果颜色是我最喜欢的红色，而且苹果味道甜甜的，非常好吃。

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