constant reading material difficult
... Constant Reading Material Difficult 恒念物力维艰 constant of viscoelastic material 茎茎 hysteresis constant of magnetic material 磁性材料磁滞常数 ...
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constant reading material difficult
持续阅读困难的材料
以上为机器翻译结果，长、整句建议使用 人工翻译 。