And it is rich in malic acid.

而且它含有丰富的苹果酸。

Malic acid occurs naturally in grapes.

葡萄中天然含有苹果酸。

Apples also contain malic acid and act as a gentle abrasive when eaten.

当然苹果中也含有苹果酸，我们在吃苹果的时候它就会轻轻地打磨我们的牙齿。

P-deficiency stress induced malic acid exudation from pigeon pea roots.

低磷胁迫下，根系可分泌苹果酸。

Seperation of Amino Nitrogen and Fruit Acid (malic acid) in Apple Juice;

氨基酸的生产过程与植物固氮有关。