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。
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。
To say is one thing, to do itis quite another.
在此动词不定式表示要去做的作业。
Evidently this springs from some defect in their nature, but itis one not altogether easy either to diagnose of to cure.
这种情形显然源于他们本性上的某种缺陷，但是这种缺陷既不容易诊断也不容易治疗。
Evidently this springs from some defect in their nature, but itis one not altogether easy either to diagnose of to cure.
这种情形显然源于他们本性上的某种缺陷，但是这种缺陷既不容易诊断也不容易治疗。
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