科学家正在根据颜色和形状对蝴蝶标本进行分类。

The scientists are ___classifying the butterfly specimens by color and shape.

图书馆员正在按照主题将新书分类上架。

The librarian is ___classifying the new books by subject before shelving them.

这份报告被列为机密文件，只有高层管理人员才能查阅。

This report is ___classified and only accessible to top management.