水果含有天然氨基酸，如柳橙和柠檬柠檬酸、苹果酸苹果，酒石酸的葡萄。
Fruit contains natural acids, such as citric acid in oranges and lemons, malic acid of apples, and tartaric acid of grapes.
水果含有天然氨基酸，如柳橙和柠檬柠檬酸、苹果酸苹果，酒石酸的葡萄。
Fruit contains natural acids, such as citric acid in oranges and lemons, malic acid of apples, and tartaric acid of grapes.
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