In each position compare the test area with the surface of the reference area.
在每一个位置把测试区域与参考区域的表面做比较。
They need to learn how to use encyclopedias and other books in the reference area of the library.
他们需要学习如何使用百科全书及图书馆资料区里其它书籍。
They need to learn how to use encyclopedias and other books in the reference area of the library.
他们需要学习如何使用百科全书及图书馆资料区里其它书籍。
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