“周年变化”是天文学专有名词。来自中国天文学名词审定委员会审定发布的天文学专有名词中文译名，词条译名和中英文解释数据版权由天文学名词委所有。
... annual cycle年循环 annual fluctuation周年变化 annual investigation周年调查 ...
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The anniversary change from the testicle is it can be seen, testicle growth and seasonal characteristic breed the synchronism.
从精巢发育的周年变化可以看出,其精巢发育与季节性繁殖活动同步。
参考来源 - 红鲫繁殖周期与内分泌生理功能研究We pay more attention to soil total nutrients and soil nutrients in surface layer at preplanning than to consider region soil moisture annual variation characters.
以往研究对于土壤养分全量给予了极大的关注,测定播种前耕层土壤养分状况的居多,监测生长过程中土壤剖面养分消长规律的极少;以耕层养分含量为主要依据确定施肥量居多,考虑地区土壤墒情周年变化特征,确定施肥量和施肥深度者研究较少。
参考来源 - 旱地农田土壤有效养分与水分时空耦合关系研究The fullness and the fillness index showed annual changes, which may be attributed to the changes of the water temperature and idiophase.
丰满度和饱食指数均呈周年变化，这可能与水温变化和繁殖期有关。
参考来源 - 中国宽鳍鱲Zacco Platypus (Cypriniformes: Cyprinidae)分子系统学、物种分化及其生物学特性的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
各离子的周年变化主要是受补充的外源水影响；
The annual change of ions was mainly influenced by the contents of ions from exotic waters.
肥满度、蛋白质、脂肪和糖原的周年变化与繁殖季节有关。
The yearlong changes of the meat condition index, proteins, lipids, and glycogen correlated with the reproductive season.
各林区枯枝落叶的持水量及持水率的周年变化规律与落叶规律相一致。
The variational disciplinarian of waterholding quantity and waterholding rate were in consistent with the defoliation in anniversary.
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