Conservative cooking such as steaming or boiling causes only modest loss of some nutrients, such as folate, while enhancing the bioavailability of others, such as carotenoids.

保守烹饪如蒸，煮只造成少量的营养物质损失如叶酸，而加强了对其他物质的生物利用度，如类胡萝卜素。

youdao

Peeled potatoes if not cooking immediately, should be soaked in cold water, so black, but not soak for too long, so as one of the loss of nutrients;

去了皮的土豆如不马上烧煮，应浸在凉水里，以免发黑，但不能浸泡太久，以免使其中的营养成分流失；

youdao