backwards and forwards (e.g. of piston or pump action)
to reciprocate (of machine part)
Definitions (Wiktionary)
verb
to go and come back; to make a round trip; to go forwards and backwards
verb
to contact; to get in touch with
adv
again and again; repeatedly; time and time again (syn.) 屢次, 反覆, 多次, 屡次, 再三, 屡屡, 屢屢, 频频, 一再, 重重, 比比, 頻頻
Examples (Wiktionary)
Mandarin
实践、认识、再实践、再认识,这种形式,循环往复以至无穷,而实践和认识之每一循环的内容,都比较地进到了高一级的程度。
實踐、認識、再實踐、再認識,這種形式,循環往復以至無窮,而實踐和認識之每一循環的內容,都比較地進到了高一級的程度。
shí jiàn , rèn shi , zài shí jiàn , zài rèn shi , zhè zhǒng xíng shì , xún huán wǎng fù yǐ zhì wú qióng , ér shí jiàn hé rèn shi zhī měi yī xún huán de nèi róng , dōu bǐ jiào de jìn dào le gāo yī jí de chéng dù .
This form repeats itself in endless cycles, and with each cycle the content of practice and knowledge rises to a higher level.