Process synchronization is an emphasis and difficulty in the teaching of operating system course.
在操作系统课程的教学中，进程同步是其中一个重点，也是难点。
Chinese character is the key as well as the difficulty of Chinese teaching.
汉字是汉语学习的重点也是难点。
Basketball dummy play skill is affect by degree of difficulty, body quality and teaching technique.
篮球假动作技术掌握受动作的难易程度、身体素质、教学技巧等多种因素的影响。
Basketball dummy play skill is affect by degree of difficulty, body quality and teaching technique.
篮球假动作技术掌握受动作的难易程度、身体素质、教学技巧等多种因素的影响。
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