So the Angle is very small, so we should be able to make a perfectprediction about the period.
所以角度很小，因此我们能够，对于这个周期进行，完美预测。
2
Weather prediction has never been a perfect science.
天气预报从来都不是一门准确无误的科学。
《柯林斯英汉双解大词典》
3
They assume that there is some possibility of predicting the consequences of strategic choices (for example, predictions abased on structural market analysis), but no prediction can be perfect.