см. тж. бывает; если это так; наблюдаться; происходить; существовать

• The minimum value of t[sub]d[/sub] occurs when Eqs. (3-7b) and (3-7c) are equal.

• A similar situation exists (or prevails, or obtains, or takes place) with regard to the total content of ...

• Under certain conditions this actually is the case.

• This is not always the case.

• These ultraviolet effects occur at about 0.3 ?.

• The year 1959 saw a marked improvement in the world freight position.

• The last quarter of the year showed a sharp increase in ...

• A similar relation holds for the frequency of the heart beat.

• The following relationships are true (or hold true, or hold good, or hold, or are valid).

• Mass transfer is involved whenever a chemical reaction takes place.

• The last few years have seen the first steps into the new territory of ...

• At low pressures, second-order kinetics obtain.

• Equation (8.1) holds throughout the flow.

• Such a reaction occurs not only with aldose but also with ketose sugars.

• The available evidence suggests that this valley was the habitat of some of the earth's earliest living things.

см. в других местах