He found that the peaks and troughs in the volume of google searches for certain products , such as cars and holidays , preceded fluctuations in sales of those products .
Stock markets have also recovered strongly from troughs in march 2009 , particularly in the us .
此外,股市已从2009年3月的波谷中强劲复苏,尤其是在美国。
Eg. looking at a close-up of the temperature spike , we see distinct troughs right next to the spike .
观察对温度尖峰的特写,我们可以看到恰好在尖峰附近有一个明显的波谷。
Third , the market has also seen two bear market troughs since 1920 : 1932 and 1981 .
第三,自1920年以来,市场经历了2个熊市波谷:1932年和1981年。
The batteries of cars that were not being driven might , according to some visionaries , act as reservoirs which a power company could draw upon to smooth out peaks and troughs in demand .
The length of the reference path is such that if no sample is present , the two daughter beams will be as perfectly in phase when they meet as they were when they were separated . The crests and the troughs of their waves will reinforce each other , and the result will be brightness .