我听到的是，趁新鲜急冻就几乎保留了所有的营养。

Because vegetables are usually frozen immediately after harvesting, they generally retain many of their nutrients.

In fact, one study showed that blanching and freezing vegetables for up to 2 months did not significantly alter their phytochemical content.

Frozen vegetables generally retain many of their nutrients. However, freezing may also increase or decrease the nutritional value of certain vegetables.

https://www.healthline.com/nutrition/are-frozen-vegetables-healthy#:~:text=Because%20vegetables%20are%20usually%20frozen%20immediately%20after%20harvesting%2C,did%20not%20significantly%20alter%20their%20phytochemical%20content%20%281%29.