... 周期（性）流星雨 periodic stream 周期变星 periodic variable 周期差 periodic inequality ...
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... periodic time ==> 周期,周期时间 periodic variable ==> 周期变量 periodic variation ==> 周期变化 ...
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Even ecosystems, such as tropical rain forests, which don't have variable rainfall, also have patch dynamics due to periodic storms and tree falls.
甚至生态系统，比如热带雨林，没有可变的降雨量，但由于定期下暴雨和减少树木，该地带有了变化的内在动力。
Periodic change imposed on a controlled variable or a function by a controller.
通过控制器控制某一变量或函数进行周期性变化。
In this paper the second fundamental problems in anisotropic elastic plane with periodic cracks are discussed by the complex variable methods.
采用复变方法，讨论了带周期裂缝的不同材料拼接的各向异性弹性平面第二基本问题。
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