accidental fluctuation

英 [ˌæksɪˈdentl ˌflʌktʃuˈeɪʃn]

美 [ˌæksɪˈdentl ˌflʌktʃuˈeɪʃn]

偶然变动；无规则变动

In the paper, mean-standard deviation control chart method and mean-covariance control chart method were applied to control dry density of clay filling in No. 24 dam and its accidental fluctuation in construction. By using the method the engineer may earlier put forward forecasting programs and prevent failure.
应用统计控制图法，选用平均值标准差、平均值极差控制图法，控制24坝粘土填筑干密度值及施工偶然异常波动，早期提出警报，以保证土坝的施工质量。
The real business cycle theory regards the accidental and real impact such as the technological impact from the supply as the root of the economic fluctuation.
它突破了货币周期理论，把来自供给方面的技术冲击等意外真实冲击看作是经济波动的根源；
Accidental devaluation of RMB in first quarter of this year broke the unilateral appreciation expectation, meanwhile, bidirectional fluctuation of RMB exchange rate is aggravating.
今年一季度人民币的意外贬值打破了人们对于人民币兑美元单边升值预期，人民币汇率双向波动且日益加剧。