例句與造句

1. Early pitons were made of malleable iron and soft steel and would deform to the shape of the crack when driven into the rock, which worked well in the irregular cracks found on European limestone.
2. Stuart Katz, president of the New York State Roofing Contractors Association in Albany, N . Y ., said that another sign of an ailing roof is " alligatoring " _ the appearance of small irregular cracks on the surface of a flat asphalt roof.
3. It's difficult to find irregular cracks in a sentence. 用irregular cracks造句挺難的