"These eruptions are made up of many small explosions of hot gas bubbles."这句话怎么翻译?

These eruptions are made up of many small explosions of hot gas bubbles.这句话怎么翻译? Are these 英语翻译Although direct evidence of recent eruptions is lacking,scientists believe that these volcanoes were active as recently as 100 million years ago. Are these your trousers?Yes,these are, these are his shoes.( )are these ()? Are these your Are these your pencils? These bags are heavy. Are these pens ___? Are these shoes? These are my friend how much are these are these( )tickets? These are ()() my books. are these ( )(watch)yours? Are these books ( )(your)? who are these? WHAT ARE THESE?意思