他补充说：如果能实施适当的农业政策，（科学家）提供更好的农作物品种和更精良的技术，欠发达国家就可以做到自给自足。
'LDCs are capable of feeding themselves now,' he added, 'if they adopt appropriate agrarian policies and . . . [scientists] give us better varieties and improved technology.'
本文介绍以作物自给度来确定适宜灌水时期的一种新方法。
In this paper, a new method, by using the self-sufficiency degree of crops to determine the suitable irrigation period, has been introduced.
它将单一经营的出口农作物生产代替了传统的多元生农业，需要地方的自给自足。
It replaces the traditional polycultures, required for local self-sufficiency, with monocultures producing crops for export.
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