例句與造句

1. abstract : the colour, collapse phenomenon and chemical component of the friction surface of powder metallurgy airplane brake materials with different base are studied in this paper
   文摘:在不同的摩擦速度下，考察了鐵基、鐵銅基及銅基粉末冶金航空剎車材料摩擦面的變化情況。
2. It's difficult to find collapse phenomenon in a sentence. 用collapse phenomenon造句挺難的