例句與造句

1. the failure of concrete is caused by the formation, growth and confluence of crack, then creating the macro cracks in concrete
   研究表明混凝土的開裂，首先起源于骨料和砂漿的粘結(jié)界面，進而發(fā)展至砂漿中。
2. It's difficult to find macro cracks in a sentence. 用macro cracks造句挺難的