A lemon is an acid fruit.

柠檬是一种酸味水果。

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The acid in the lemon juice is a natural mild bleach and is effective in cleaning and deodorizing.

柠檬酸是一种天然温和的漂白物，并对清洁和去味有奇效。

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Lemon juice, which contains citric acid, has a similar effect, and it is likely that lime juice does as well.

能和醋媲美的还有柠檬汁，其中的柠檬酸也有和醋酸相似的效用。

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The acid from the lime, lemon or orange juice changes the structure of the proteins in the fish much in the same way that heat does. (If you make it at home, you can observe the flesh turning from translucent to opaque.) Therein lay my answer.

NPR: Cool and Comforting Ceviche

The most commonly used lemon-flavor molecule, citral, fades within 30 days when put in an acid medium like lemonade.

FORBES: Life