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。
Chinese character teaching is the basis of teaching Chinese to foreign students, also it 's difficult point compared with others.
汉字教学是对外汉语教学的基础，也是一个难点。
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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