White wine is the product of the fermentation of pure grape juice obtained from grapes by extraction from grapes.

白葡萄酒是从葡萄中提取纯葡萄汁发酵得到的产品。

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Vinifera has been honed into hundreds of varieties, red and white; but the grapes are all still members of the same species, with limited cross-breeding between different varieties.

欧亚葡萄已经被培养出几百个变种，或红或白；但是这些葡萄跟其他品种的葡萄杂交的几率非常的小，所以它们仍然属于同一种类。

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Grapes are purple and Onions are white.

葡萄是紫色的。洋葱是白色的。

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Sauvignon Blanc and Riesling are other well known white grapes.

VOA: special.2010.10.13

For example, in Italy's Piedmont region there are familiar white grapes like Moscato and Gavi, as well as lesser known varietals like Erbaluce and Arneis.

WSJ: The Unique Charms of 'Miscellaneous Wines' | On Wine by Lettie Teague

But it's Italy that offers a veritable roll call of world-class "miscellaneous" white grapes in fact, the obscure whites of Italy could fill an entire wine list.

WSJ: The Unique Charms of 'Miscellaneous Wines' | On Wine by Lettie Teague

What about white grapes?

WSJ: Wine and Food: Pairing Without Overthinking | On Wine by Lettie Teague