现在我们可以向上看，线条背衬着干净的蓝天。

Now we can look up and see the lines against a clear blue sky.

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所述背衬包括第一表面和第二表面。

The backing comprises a first surface and a second surface.

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用结实的硬纸板作这幅画的背衬。

Back the picture with strong cardboard.

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用结实的硬纸板作这幅画的背衬。

Back the picture with strong cardboard.

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