以下为句子列表：
英文: Based on the researches of Neogene calcareous nannofossils from the Pearl River Mouth Basin, this paper briefly reviews the researching and developing process.
中文: 摘要根据珠江口盆地新近系钙质超微化石研究文献，综述了研究内容及发展过程。
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英文: Because of alkaline calcareous nature of soils, availability of micronutrient is a problem, particularly Zn in rice soils, Cu and Zn in citrus and Fe in apples.
中文: 因碱性石灰性土壤的特性，微量养分有效性不高，特别是水稻土中缺锌，柑桔园中缺铜缺锌和苹果园中缺铁。
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英文: Both a review and a perspective of the study on Neogene calcareous nannofossils of this region are given.
中文: 评述了以往研究中存在的问题，明确了今后研究的方向与任务。
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英文: Calcareous deposits are usually formed on cathodically protected steel surface in sea water, and their importance in reducing the current requirement to maintain adeguate protection is generally recognized.
中文: 摘要钙质沈积通常会在阴极保护的海水结构物上沈淀，而减少要达保护电位所需的电流密度。
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英文: High-latitude calcareous phytoplankton and zooplankton might share a similar fate, although their declines would come decades later because their shells are formed from calcite, the less soluble form of calcium carbonate.
中文: 高纬地区的钙质浮游植物和浮游动物可能有相似的命运，虽然它们受到影响的时间也许会晚数十年，因为钙质浮游生物的外壳由方解石形成，这种碳酸钙矿物结晶比较不容易溶解。
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