Most of the key observations were made in the 1960s and 1970s.

He made some key observations about the geology which still stand.

This brings us to the second key observation of the theory.

A few key observations helped geologists come to their conclusions.

Through her experiences in these countries, Wright made two key observations that would inspire her work.

A key observation about the conjuncts is that they are not constituents.

The key observation was things like kidney deficiency affecting the function of the liver.

The key observation is that the bigger the effect, the smaller the probability of it happening.

Our conclusions are supported by several key observations.

The key observation is based on the following sparsity property of the point set.