Agricultural societies cannot exist without staple crops.
农业社会的存在离不开主粮作物。
All the recorded staple crops grown in western Africa were introduced from elsewhere, beginning, at some unknown date, with rice and yams.
西非所有从某个未知的日期开始记录的主要农作物都是从其他地方引进的，刚开始是种植水稻和山药。
The total output value of staple crops was increased by 10%.
主要作物总产值将在现状基础上增加10%。
One or two staple crops are the chief sources of food intake.
两种主要农作物是人们食物的主要来源。
Few things matter to human happiness more than the yields of staple crops.
对于人类福祉而言，几乎没有什么比主要粮食作物的产量更重要的了。
China has set up 11 research stations in Africa to boost yields of staple crops.
中国已经在非洲建立了11个研究站来提高主要农作物的产量。
Plantations in Maryland, Virginia and the Carolinas grow staple crops of tobacco, rice and indigo.
马里兰、弗吉尼亚和卡罗来纳的种植园盛产烟草、大米和靛蓝类染料。
And since Africans tend to depend on a few staple crops, rises in cereal prices can be devastating.
而且因为非洲越来越依靠几种主要作物，谷物价格的攀升将会是毁灭性的。
Plantations in maryland, virginia and the carolinas grow staple crops of tobacco, rice and indigo .
马里兰、弗吉尼亚和卡罗来纳的种植园盛产烟草、大米和靛蓝类染料。
The cuisine of Gansu is based on the staple crops grown there: wheat, barley, millet, beans, and sweet potatoes.
甘肃省的饮食以当地的主要农作物小麦、大麦、小米、豆子及甘薯为基本原料。
And the growth in yields has been slowing down, from about 3% a year for staple crops in the 1960s to around 1% now.
产量增长已经放缓，粮食作物从1960年的大约3%每年降到现在的1%左右。
But by the end of 1920, with the abrupt cessation of wartime demand, the commercial agriculture of staple crops fell into a sharp decline.
但到了1920年末，战时的需求突然终止，生产主要作物的商业性农业遂一蹶不振。
So you have a mix here of 50% America's staple crops of corn, beans, wheat and sugar... 25% beef and pork... and 25% cocoa, coffee and cotton.
因此，混合起来，就有了由玉米、大豆、小麦和糖组成的50%美国的主要作物……25%牛肉和猪肉……和25%可可、咖啡和棉花。
Working with staple crops like beans and corn, Lynch identifies which root traits -like deep, or shallow -will help plants get the sustenance they need.
林奇利用豆子和玉米之类的主要农作物进行实验，发现根的特点——比如深的或是浅的——都会影响植株对必需养分的吸收。
The scientists looked specifically at places where there are warming trends, and sure enough, they found these staple crops weren't doing quite as well.
科学家在那些足够确定了的具有变暖趋势的地区进行了特别的观察，他们发现那些主食谷物长的并不十分好。
Working with staple crops like beans and corn, Lynch identifies which root traits - like deep, or shallow -will help plants get the sustenance they need.
林奇利用豆子和玉米之类的主要农作物进行实验，发现根的特点——比如深的或是浅的——都会影响植株对必需养分的吸收。
Although prices for staple crops have now stabilised, DfID is still predicting long-term problems in producing and procuring food for nearly 1 billion people.
虽然现在的主要农作物的价格已经稳定下来了，国际发展部仍然预计近10亿人的粮食生产与购买会是一个长期性的问题。
Some of the world's staple crops will be affected by drought and altered rainfall patterns, Oxfam said, and the implications for millions of people could be disastrous.
乐施会说，世界上一些主要粮食作物将受到旱灾及降雨模式变化的影响，这对于数百万人的影响将是灾祸性的。
Already British farmers are experimenting with apricots, peaches, almonds and olives; in the future, staple crops such as durum wheat, soya and maize might become viable, too.
英国农民已经在试种杏、桃、扁桃和橄榄；将来，可能也能种植硬质小麦、大豆和玉米之类的主要农作物。
Natural rubber and sugarcane are staple crops of Hainan province and they are very important components of Hainan's agricultural production structure and agricultural product output value.
天然橡胶和甘蔗是海南主要农作物品种，在海南农业生产结构和农业产值结构中占有重要地位。
There is the worry that an increase in the use of food crops such as maize, cassava and sorghum is likely to increase the food price of most staple foods in Africa, notably corn.
人们担心对粮食作物如玉米、木薯和高粱不断利用可能会造成非洲主要粮食价格的不断上涨，特别是玉米。
Maize is one of the world's four most important food crops and the staple of more than a quarter of a billion east Africans.
玉米是世界上四大重要粮食作物之一，也是超过二亿五千万非洲东部人的主要粮食。
Maize is one of the world's four most important food crops and the staple of more than a quarter of a billion east Africans.
玉米是世界上四大重要粮食作物之一，也是超过二亿五千万非洲东部人的主要粮食。
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