| 单词 | provitamin A |
| 释义 | provitamin A (extremely rare) n WORD FAMILY provitamin A USAGE EXAMPLESTake, for example, Golden Rice, a provitamin A–enriched rice developed through genetic engineering that comprises many of the properties advocated by Schumacher and Brand. Scientific American(Sep 06, 2013) n an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver Syn|Hypo|Hyper carotene, carotin beta-carotene an isomer of carotene that is found in dark green and dark yellow fruits and vegetables provitamin vitamin precursor; a substance that is converted into a vitamin in animal tissues |
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