The motor works by the periodic reversal of the current running through these windings .
电动机的工作原理是流经线圈的电流方向的周期性改变。
Periodic crackdowns on back-alley or bargain surgeries attempt to keep the emerging industry in check .
政府阶段性的对黑市或廉价整容手术进行整顿,使得这个新兴行业的发展得到抑制。
There is a growing belief that this spectacular sell-off portends more than just a periodic shift in the market cycle .
人们越来越相信,此次股市大跌预示的不只是市场周期中一个阶段性转折。
Act which requires that all banks and all institutions that accept deposits from the public make periodic reports to the federal reserve system .
此法案要求美国所有接受公众存款的银行和机构,必须向联邦储备局提供阶段性报告。
As japan ran a pay-as-you-go pension system , the system was not fully funded and needed periodic adjustments in payment and / or premiums to accommodate the changes in demographic and other circumstances .