I
см. тж. наблюдаться
• Anaplastic cells are derived from adult, differentiated cells.
• This change comes about by virtue of the force acting on ...
• Such explosions come ( about ) ( or occur ) each 100 years.
II
см. тж. иметь место ; наблюдаться
• No major breakthrough has come about ( разг. ).
• Most of the world's volcanic activity is found near the boundaries of ...
• We know from experience that this does not happen .
• This process has been going on for 3 billion years.
• The change from melt to crystalline rock happens ( or occurs ) rapidly.
• Here, fluvial denudation has been in progress for long periods of time.
• Expansion of the clay mass results when more water penetrates ...
• The Mediterranean Sea was the site of extensive evaporite depositions ( B Средиземном море происходили ... ).
• Processes of fluvial denudation are at work from the very beginning.
• Such an event will never come to pass .
• Two processes operate simultaneously.
• Every living cell is a seat of numerous metabolic reactions.
• Combustion will occur ( or proceed ) at any pressure if a suitable catalyst is added.
• If a leak occurs urgent measures should be taken.
• Under these conditions the transformation of heat energy into other forms of energy takes place .
• The 1930s saw a marked spurt in the technological applications of catalysts.
• The past 20 years have witnessed an amazing increase in the number of molecules detected.