contaminates

"My friend told me there was something in the box, but I didn't know what it was yet. "

"Let me introduce you to my friends."

"The foreign student in my class has a different cultural background than the rest of us. "

"The spilled juice contaminated the clean tablecloth, making it unusable. "

"Even animals in the Jewish system cause impurity only when they are dead."

"The new student was considered an undesirable in the class because of his disruptive behavior. "

"Letters are the elements of written language."

"The association of the students with the school's environmental club was evident in their increased recycling efforts. "

"the introduction of a new product into the market"

"unwholesome air, or food"

"The family-owned factory in China handled the export of toys to many countries. "

"Railway crossings without gates are highly dangerous."