Assessment of image fusion quality is the important part of image fusion, and itis also one of the most difficult problems in this field.
图像融合质量评价是图像融合研究领域的重要组成部分，也是难点之一。
Chemical equilibrium is one of the basic theories in middle school, and itis also a difficulty in teachers' instruction as well as students' learning.
化学平衡是中学化学三大基础理论之一，也是教师教学和学生学习中的难点。
No one can say for sure what the acoustical qualities an auditorium will be before itis finished.
一个礼堂完工之前，任何人也说不准它的声学质量会怎样。
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