Rice is a main food in people's life.

大米是人们生活中不可缺少的主食粮食。

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The product is a new resource food made of main raw materials, including cordyceps fungi powder, ginsenoside, donkey spermary, hartshorn and so on.

这种产品是以虫草菌粉、人参皂苷、驴睾丸、鹿茸等为主要原料制成的新资源食品。

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In the sentence 'They often go to Italy because they love the food', 'They often go to Italy' is the main clause and 'because they love the food' is a subordinate clause.

在They often go to Italy because they love the food这个句子里，They often go to Italy是主句，because they love the food是从句。

《牛津词典》

A suicide bomber blew himself up inside the main office of the United Nations World Food Program in Islamabad last week, killing five employees of the agency.

VOA: standard.2009.10.11

The hard beaks of giant squid, a main source of food for sperm whales, have often been found inside lumps of ambergris.

BBC: Warning follows whale vomit find on Morecambe beach

Mac's on Main is a popular soul food restaurant in South Carolina's capital, Columbia.

NPR: South Carolina Voters React to Skirmish over Race

For instance, a plastic bag discarded in the sea could be mistaken by a turtle for a jellyfish, their main source of food.

CNN: Turtles in race to beat extinction