imperceptibly
不知不觉───imperceptibly
Slowly and almost imperceptibly the road started to climb upwards, looping its way in languid curves around the forested hills.───道路缓慢而几乎不可察觉地开始向上攀升，在林木环绕的山丘上曲折地蜿蜒前进。
Allopatric speciation can also be brought by the imperceptibly slow but colossal movements of the tectonic plates that make up Earth's surface.───构成地球表面的那些构造板块极其缓慢但剧烈的运动，也可能导致异地物种形成。
The disease develops gradually and imperceptibly.───该疾病难以察觉地逐渐发展着。
For the whole ancient wisdom of man is founded upon the conception of a life which in its fundamentals changes imperceptibly if at all.───因为人类自古以来的全部思想都建立在对生活的一种观念上——即使生活发生变化，在基本原则方面的变化却很小。
Imperceptibly have worked in the company for more than a year. In this year, I learned a lot of things.───不知不觉已经在公司工作一年多了。在这一年多里，我学到了很多东西。
She sat calmly and with dignity , but, almost imperceptibly, she made a quick motion with her right hand.───她高贵而平静地坐在那里，但几乎不被察觉地，用右手做了一个快速的手势。
New problems arose imperceptibly.