A watermelon is red inside and green outside.

西瓜内红外绿。

《新英汉大辞典》

Red squirrels disappear inside the trees.

红色松鼠藏到树里面去了。

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The words 'I love you' were written inside a big red heart.

“我爱你”这几个字写在一个大红心里。

《牛津词典》

Beets with circles of red and white inside are known as candy cane or candy stripe beets.

VOA: special.2009.02.17

They're red because they contain a special protein called hemoglobin which is very concentrated inside the cell.

红细胞的红色源于,其内部一种叫做血红蛋白的特殊蛋白质,血红蛋白在细胞内的浓度很高

耶鲁公开课 - 生物医学工程探索课程节选

Inside the head it's bright red because it's pulsing with blood.

在颅内的时候,它是鲜红色的,因为它充满了鲜血

耶鲁公开课 - 心理学导论课程节选

A1C is the amount of sugar that has attached to hemoglobin the substance that carries oxygen inside red blood cells in your blood.

CNN: Diabetic neuropathy

But with thousands of teenage fans letting out ear-splitting screams for their idols on the red carpet and inside the Echo Arena, Mobo artists now dominate the pop music world.

BBC: Mobo Awards: Emeli Sande scoops three prizes

Wilson said he believes that alcohol may have played a part in West's actions, given that the rapper appeared both on the red carpet and inside the arena with a bottle of cognac.

CNN: Anger over West's disruption at MTV awards