I think is the most difficult physics at the University of statistical physics, the other okay! Power dynamics and fluid dynamics as long as you Haojiu Hang calculus! Mechanical fundamentals down first, rigid body mechanics is still relatively easy to learn, those who are university foundation course, not be too difficult! In such cases I think you should first clarify the basic concepts, basic exercises to do with mathematics on the line! Rigid body is a model of reality does not exist, it is characterized by the deformation of incompressible non! In the physical modeling has important applications in the process! What is wrong with exploring it!
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If you are talking about a subject you know well, as I've just advised, prepared, preparing the speech itself should not be too difficult.
如果你正在谈论一个你很熟悉的话题，就像我刚才建议的，做好准备；准备演讲本身应该不是太难。
In the medium term that should not be too difficult.
这在中期是不难实现的。
But protecting plants and trees in the garden may not be too difficult if you follow a few Suggestions.
但是，如果你遵循一些建议的话，保护果园中的植株和树木却并非难事。
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