In other words, basic science is a necessary but not sufficient condition for remaining industrially competitive.

换句话说，保持工业强大的竞争力，基础科学是必须的，但并不是全部。

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Our modern lifestyle is thus a necessary, but not a sufficient, condition for the high prevalence of obesity in our population.

我们的现代不良生活方式是个必然因素导致肥胖，但并不是致使我们整体人口数量中肥胖人口快速蔓延的全部原因。

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The IMF suggests that a sufficient (although not necessary) condition for a global recession is any year in which world GDP per head declines.

IMF认为世界年度人均GDP下降是全球经济衰退的一个充分条件（而不是必要条件）。

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Chavez and his revolution are so powerful that various governments in South America, including that of Brazil, a rising world power, viewed the victory of Chavez in the October elections as a necessary condition for the continuity of regional integration.

CENTERFORSECURITYPOLICY: Some Reflections Over Speculations on Venezuela's Future

Building capacities in Member States for Open Access is a necessary but not sufficient condition for promotion of OA. Creating an enabling policy environment in Member States for OA is therefore a priority.

UNESCO: OFFICE IN TASHKENT

This is self-explanatory, but here is another tweet that caught my eye on the same point: My basic premise is that the awareness of American college students is NOT a necessary condition for conflict resolution in Africa.

BBC: Joseph Kony campaign under fire