以下为句子列表：
英文: In this paper, the researches on the substitutions of Ca-polyhedral, P-tetrahedral and channel positions in apatite structure are reviewed, the structural sites, substitution forms and mechanism of isomorphic ions are discussed, and the influence of the s
中文: 摘要综述了作为重要环境矿物材料的磷灰石在钙位、四面体位和结构通道位置上类质同象替换的研究进展，讨论了替换离子的结构占位、替换形式和机理，并就替换对这种矿物在环境治理领域应用的影响进行了简要评述。
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英文: Pollen grains are highly variable in size and shape ranging from 5μ to over 200μ in diameter and from circular to tetrahedral or dumbbell shaped.
中文: 花粉粒的壁由两层构成，外壁为孢粉素壁，具有很强的抵抗力，其上有特征性雕纹或孔纹。
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