см. тж. в какой бы форме ... ни встречался ; встречаться ; если он существует ; иметь место ; иметься ; не ~
• Such stresses obtain when ...
• Many such systems are in existence ( or are found , or exist , or are available ) , ( or There are many such systems , or There exist many such systems ).
• Electromechanical devices are ( still ) with us ( today ), and will be around for a long time to come.
• The Solar System has been in existence for five billion years.
• Olivine is unstable under the low temperatures and pressures that prevail at the surface.
• Such eddies have been known to persist for two years.
• Although corrosion by gases is similar to corrosion by liquids, two important differences are found .
• Both polymeric and dimeric hydrogen bonding structures can occur in solution.
• Cold climates occurred in regions that are hot at the present time.
• Such factors are always found in pairs.