The reading ___(材料) is difficult t understand.

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Thereading___(材料)isdifficulttunderstand.Thereading___(材料)isdifficulttunderstand.Thereading___(材料)isd

The reading ___(材料) is difficult t understand.
The reading ___(材料) is difficult t understand.

The reading ___(材料) is difficult t understand.
material

material