Temporaluncertainty before, in the past when using ago.
时间的不确定性面前，在过去在使用前。
2
Because of the spatial-temporal variability and inhomogeneity of natural factors and the uncertainty of human activities, runoff and sediment yielding is a complicated nonlinear process.
由于自然因素的时空变异性和不均一性以及人类活动的不确定性，因此产流产沙是一个复杂的非线性过程。
3
A new method to measure real-time sensitivity of Doppler lidar is presented, to solve the sensitivity uncertainty problem caused by the spatial and temporal change of aerosol during wind detecting.