Periodic fluctuations
[經] 周期性波動
?? 詞語組成解析
periodic
[,p?r?'ɑd?k]
adj. 周期的;定期的;回歸的;間歇的，時而發生的;
n. 起伏現象；變動；波動（fluctuation的復數）
??? 情景例句
Would you mind opening your suitcase?
請把您的箱子打開，好嗎？
Liberty often degenerates into lawlessness.
自由隨便，經常墮落到無法無天。
If one group of people were disturbed from their eye-movement sleep for several nights on end,
如果有兩組人，一組人連續幾夜在眼球隊活動時被叫醒；