请用英文介绍一种食物．

食物．lemon, one of the citrus fruits citrus fruits, widely used edible fruits of plants belonging to Citrus and related genera of the family Rutaceae ( orange family). Included are the tangerine, citrange, tangelo, orange, pomelo, grapefruit , lemon , lime , citron , and kumquat . Almost all the species bearing edible fruits are small trees native to SE Asia, Indonesia, or Malaysia.
..... Click the link for more information. , from a tree (Citrus limon) of the family Rutaceae (orange orange, name for a tree of the family Rutaceae ( rue , or orange, family), native to China and Indochina, and for its fruit, the most important fresh fruit of international commerce. Its physical characteristics (especially the rich citric acid and vitamin content of the fruit) and history of cultivation are similar to those of the other types of citrus fruits , all of which are species of Citrus.
..... Click the link for more information. family), probably native to India. A small tree (to ab