英语翻译notuntilbeginningofthetwen-查字典问答网
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  英语翻译notuntilbeginningofthetwentiethcenturywasitrecognizedthatcertainsubstanceswereessentialinthediettopreventorcurecomedisease.thesesubstancesarenowknownasvitamins.theyarevitalforgrowth,goodhealth,andmainten

  英语翻译

  notuntilbeginningofthetwentiethcenturywasitrecognizedthatcertainsubstanceswereessentialinthediettopreventorcurecomedisease.thesesubstancesarenowknownasvitamins.theyarevitalforgrowth,goodhealth,andmaintenanceofthenormalfunctionsofthebody.awell-balanceddietshouldprovideallthevitaminswenormallyrequire.thoseofuswhoarefortunateenoughtobeabletobuysufficientfoodshouldnotsufferfromvitamindeficiency.however,forvariousreasons,somepeopledonotmaintainabalanceddiet.peopleoftenlosetheirappetitebecauseofillness.peoplelivingalonemaynotbothertoeatpropermeals,peopleonadietmaynoteatsufficientquantitiesofnecessaryfoods.

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2020-05-2418:57
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李碧

  直到20世纪,人们才认识到饮食中有某一种物质对预防或治愈疾病是必须的.我们现在知道这些物质就是维生素.它们对身体成长、健康和维持正常机能是必不可少的.均衡的饮食可以给我们提供所有正常需求的维生素.我们中的幸...

2020-05-24 19:01:30
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