The components of hybrid composites are quite complicated and diverse. Therefore it 's difficult to predict its thermal expansion coefficient.
由于混杂复合材料组分多、结构复杂，因此预测其热膨胀系数难度较大。
It 's difficult to assess the effects of these changes.
很难评价这些变化的影响。
It 's difficult to assess the effects of these changes.
很难评价这些变化的影响。
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