这项民意调查的误差幅度为3个百分点。

The poll has a ___margin ___of ___error of 3 percentage points.

随着科学的进步，医学诊断的误差范围在缩小。

As science advances, the ___margin ___of ___error in medical diagnoses decreases.

工程师在他们的设计中总会允许一个小的误差范围。

Engineers always allow for a small ___margin ___of ___error in their designs.