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。
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。
On the one hand itis an abstract unit (underlying individuals speaking) in language system-strictly regular in structure: it is termed a syncteme in the thesis.
一方面它是语言系统的抽象单位，有着严格规范的结构，是人们使用语言的基础，在本文中被称作句位。
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