см. тж. иметь место ; происходить
• Another major effect of topography is seen ( or observed ) in lowland sites.
• Naturally occurring infections caused by ... have been seen in cattle, rodents, ...
• Very little wear is evident ( or observed ).
• The above effects were noted after irradiation of about 10 7 r .
• These absorption bands do not occur in the vapour phase.
• Frog skin exhibits ( or shows ) a potential difference of 20-90 mV with the inside positive.
• An interesting situation obtains in connection with an externally heated cathode.
• These sources are not found in rich clusters of galaxies.
• High-output cardiac failure can occur, but is only seen infrequently ( мед. ).
• More than simple bonding between amino acids was evidenced in these reactions.
• Also present in the spectrum were lines not familiar to me.