common occurrence; encountered with many times; often (/frequently) seen ; nothing new; occur repeatedly
? 新制度的鞏固過(guò)程和舊影響的消失過(guò)程，都不是直線(xiàn)的，它們的某種波浪式的起伏現(xiàn)象，在歷史的轉(zhuǎn)變時(shí)期是～的。The consolidation of a new system and the dying away of the old influences do not operate in a straightforward fashion but occur repeatedly in the form of an undulating movement at turning points in history.
屢見(jiàn)不鮮
common occurrence;nothing new
考試作弊～。Cheating in examinations is a matter of common occurrence./婚前同居，已是～。There is nothing new about premarital cohabitation.
屢見(jiàn)不鮮lǚ jiàn bù xiān
屢：屢次，不止一次；鮮：新鮮、新奇。多次見(jiàn)到，并不新鮮。nothing new, common occurrence, common sight, be not rare