• The difference in tension between the tight and loose sides of a flat belt equals ...
• The difference in the magnitude of the five coefficients ...
• There is a significant disparity ( or difference , or divergence , or discrepancy ) between the grades of ...
• Wide variations in life between circuits that have different functions ...
• The distinction between heterogeneous and homogeneous mixtures is an arbitrary one.
• As yet nobody has been able to produce direct evidence of any structural difference among cones.