It has been frequently assumed, but not proved, that the majority of the migrants in what has come to be called the Great Migration came from rural areas and were motivated by two concurrent factors.
人们常常假设，但没有证据证明，在所谓的“大迁移”中，大多数移民来自农村地区，这是由两个同时发生的因素推动的。
It has been shown experimentally that birds can align themselvesto their normal migration routes in blue light but have trouble doing so inyellow or red, so the link seemed worth pursuing.
实验表明，在蓝光中鸟类可以按照正常迁徙路线飞行，而在黄光或红光中则做不到，因此其中的关联值得探讨。
Perhaps you see this as a risk also, but IBM has been providing migration paths for similar technologies for almost 30 years.
也许您将这也视为风险，但是IBM为类似的技术提供迁移路线已经有近30年时间了。
But the migration caused by the dam project has exacerbated problems of overpopulation and poverty along the reservoir, now that hundreds of acres of farmland have been inundated.
但工程淹没了成百上千英亩的农田，移民也令库区周围人口密度过高和贫穷问题进一步恶化。
O'Grady also pointed out that MySQL has been adding enterprise-level features, but that penetrating the high-end market would be a slow process due to the cost of migration.
O'Grady还指出虽然MySQL已经加入了不少企业特性，但由于迁移费用的桎梏，对高端市场的渗透将是缓慢的。
CBM migration with groundwater has not only been proved by hydrodynamics, but also verified from the gas composition and genesis.
地下水作用下的煤层气运移不仅从地下水动力条件得到证实，而且从煤层气的成分和成因角度也得到验证。
The rural labor migration has the important practical significance for the new countryside construction, but the disorderly and unlimited population migration may bring many social questions.
农村劳动力转移对于“新农村建设”具有重要现实意义，但不受限制、无序的人口向城市流动也会带来许多城市问题和社会问题。
Though Sulige gas field has extensive hydrocarbon generation, low migration efficiency is the main reason that the Sulige gas field has large reserves but low reserves abundance.
提出苏里格气田生烃面积虽大，但运移效率低是天然气储量大但资源丰度低的主要原因。
Though Sulige gas field has extensive hydrocarbon generation, low migration efficiency is the main reason that the Sulige gas field has large reserves but low reserves abundance.
提出苏里格气田生烃面积虽大，但运移效率低是天然气储量大但资源丰度低的主要原因。
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