双红和单红是我的两个学生,是两个女孩子,但她们俩并不是两姐妹,也没有亲戚关系,双红姓陈,单红姓蓝。她们俩不在一个班,双红在九(5)班,单红在九(6)班,我教她们的科学。她们俩的成绩都很优秀,双红在班上是第二名,单红在班上排第三,双红在 Shuanghong and Shanhong are my two students. They are two girls, but they are not two sisters, nor are they related to each other. Shuanghong Chen and Shanhong are blue. They are not in one class. They are in the nine (5) classes and the singles are in the nine (6) class. I teach them the science. Both of them have excellent results. Shuanghong is second in the class. Shan Hong is ranked third in the class.