However, in practice, the level that students grasp the function conception is lower, and students feel difficult in learning it.
但实践表明，学生函数概念掌握的水平较低，函数概念仍是学生数学学习中理解较困难的概念之一。
Because for some old with stiff legs who feel difficult in sitting down or standing up, the substantial Japanese sofa makes them more comfortable and their movement easier.
因为对于一些腿脚不便、起坐困难的老人来说，硬实的日式沙发使他们感到更舒适，起坐也更方便。
Just something about your weakness, strength, social life, working experience, social activities, learning ability, and the things that you feel difficult or you wonder.
是关于你的弱点，强项，社交生活，工作经历，社会活动，学习能力，还有你觉得对你来说困难的事或让你感到好奇的事。
And the management of manpower resources of suppositional group is facing new challenges:low trust, great different culture, strong isolated feel, difficult evalution and inspiration and so on.
相应地，虚拟团队的人力资源管理面临着成员间信任水平低、文化差异大、孤立感强、绩效评估和激励难等新的挑战。
And the management of manpower resources of suppositional group is facing new challenges:low trust, great different culture, strong isolated feel, difficult evalution and inspiration and so on.
相应地，虚拟团队的人力资源管理面临着成员间信任水平低、文化差异大、孤立感强、绩效评估和激励难等新的挑战。
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