同根派生 英汉例句The business cycle is a series of peaks and troughs.商业周期就是淡旺期交替。This is the only recession since the Great Depression to wipe out all job growth from the previous business cycle.这次衰退抵消了上个商业周期增加的所有就业岗位，是自大萧条以来的唯一一次。