высказывать предположение о том, что

• Kekule made his classical proposal that the six carbon atoms of benzene were arranged in a hexagon.

• It has been proposed (or speculated, or suggested) that a series of reactions is involved.

• He suggested that there should be two gas diffusion terms.

• Goldbach conjectured that every even number ...

• He proposed that both attractive and repulsive forces could exist between atoms.

• It is speculated that the oxygen resulted from the bombardment of the seas by certain wavelengths of ultraviolet light.

• Scientists theorize that the planets in our solar system formed at ...

• It was conjectured that the eukaryotes had eliminated the need for ... (биол.). • The suggestion has been made that the underlying asthenosphere has an undulating upper surface.

• He reasoned (or argued, or hypothesized) that erosion must be burying layers of sediment under ...