Many of the past crop production practices have resulted in environmental problems.
过去的许多耕作措施导致了很多环境问题。
FOR the past decade maize has been the seed companies' favoured crop.
在过去的十年里玉米是种子公司比较受欢迎的作物。
Questions like this crop up frequently -where do things from the past belong now?
诸如此类的问题频繁出现：历史文物现在究竟属于哪里？
Although plantings past may have fallen below the 50-percent expectation, and they probably will again in the future, I am still sustained by the crop that flourishes during the drought.
尽管过去的播种可能没有达到50%的收获期望，而且将来也可能是这样，但我仍然能靠着在旱季繁茂生长的庄稼而生存下去。
In the past five years, Sanchez said crop yields in the Millenium Villages have about tripled.
在过去5年，这些村庄的庄稼收成翻三番。
In the past, pesticides made great contribution to crop production in the world while performed some negative effects on environment.
农药曾经为世界农作物生产作出过巨大贡献，但也对环境造成了一些负面效应。
The Global Crop Diversity Trust, in a sense, is a repository of the past. It collects, preserves and maintains the raw genetic material used in agriculture.
全球作物多样化信托基金在一定意义上就是过去作物的储藏室，这里收集、保存并维护农业中使用的原始基因原料。
Althoug plantings past may have fallen below the 50-percent expectation, and they probably will again in the future, I am still sustained by the crop that flourishes during the drought.
尽管过去播种的收获没有达到50%的期望，而且将来也可能还是这样，我仍然要为经历旱季依然丰收的庄稼而坚守阵地。
In the past, studying on the suitable period for crop irrigation, the biological characteristics of crops and soil moisture were used as their standards.
过去研究在作物适宜灌水时期，多以作物生物学特性及土壤水分为标准。
Although plantings past may have fallen below the 50-percent expectation, and they probably will again in the future, I am still sustained by the crop that flourishes during the drought.
尽管过去播种的收获没有达到50%的期望，而且将来也可能是这样，我仍然要为经历旱季依然丰收的玉米而坚守阵地。
Prices for rice, the main food crop, have doubled in Bangladesh in the past year.
在去年，孟加拉国的主要食物作物大米的价格增长了一倍。
Production of the crop is rebounding after having sharply dropped during implementation of the land reform program over the past decade.
在过去十年中执行土地改革项目导致烟叶产量急剧下降之后，该国的烟叶产量正在反弹回升。
Soy plants in coastal areas of China, the world's largest soybean importer, have increased imports of the new U. S. soy crop over past weeks after crushing margins recently improved.
中国是世界上最大的大豆进口国，其沿海大豆加工厂的压榨利润近期得以改善，他们在过去的几周增加了美国新产大豆作物的进口。
Research into so-called 'extinction events' for our planet over the past 500 million years - twice as long as any previous studies - has proved that they crop up with metronomic regularity.
科学家研究了过去5亿年间地球上发生的所谓的“灭绝事件”，时间跨度是先前任何一项研究的两倍。此次研究证实大灭绝的出现是有时间规律的。
Research into so-called 'extinction events' for our planet over the past 500 million years - twice as long as any previous studies - has proved that they crop up with metronomic regularity.
科学家研究了过去5亿年间地球上发生的所谓的“灭绝事件”，时间跨度是先前任何一项研究的两倍。此次研究证实大灭绝的出现是有时间规律的。
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