1. One of the most noticeable features of the Middle Miocene rock layers was their periodicity. 中新世中期的岩层，最显著的特徵之一，就是这些岩石所呈现的周期性。
2. One timing system comes from the evidence of our senses and stomachs, and the periodicity we experience when living in a particular time zone. 一个定时系统来自于我们的感官和胃的证明，就是当我们生活在一个特定的时区所经历的周期性。
3. High cost and long periodicity of tissue engineered bone lead to limit its application in clinics as an ideal repair material of bone defects. 组织工程骨作为理想的骨缺损修复材料，由于需较高的费用和较长的周期，难以在临床大规模推广。
英英解释
n.
1. the quality of recurring at regular intervals
