It has been a research hotspot in the fields of biology, medicine-pharmacy and foodstuff science in the recent years to develop the edible and medicinal Se-enriched products with low production cost.
近年来，开发安全高效、成本低廉的补硒食品和药品，已成为生物学、医药学、食品科学等领域的研究热点。
For oil fields with low permeability and quite long production history, artificial lift and flooding methods are best choices.
对于低渗油气田或生产历史长的油气田，采取特殊方法比如人工举升和注水开发进行开采。
There are a number of low-resistivity oil pays in several fields with middle to large reserves that are discovered in Neogene in Bohai sea recently, and some of them are higher in oil production.
近几年在渤海新近系发现的一批中-大型油田中存在大量的低电阻率油层，而且有些低电阻率油层产量较高。
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