With minor exceptions, administration of immunizations is based on the chronologic age.
除了少数例外，免疫接种的管理是基于生理年龄。
Because there is a lack of fossil and chronologic data, the stratigraphic division is still disputed.
特别是由于缺乏化石及年代学资料，对研究基础的地层划分方案也一直存在争议。
Because there is a lack of fossil and chronologic data, the stratigraphic division is still disputed.
特别是由于缺乏化石及年代学资料，对研究基础的地层划分方案也一直存在争议。
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