罗老师是怎样要求她的学生交作业的？

How did Mrs. Luo ask her students to hand in their homework?

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罗老师发现这个新方法可以让学生不落后于时代。

Mrs. Luo finds the new method can let students not fall behind times.

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罗老师和他的妻子从头顶上处在黑暗中的架子上拿出盖庄稼用的朔料布给我们垫在睡袋下区隔潮湿的泥地。

Teacher Luo and his wife found us some plastic crop sheets tucked away on the dark shelf overhead to help shield our sleeping bags from the moist earth.

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