但是如何回归，这是一个有待深入探讨的问题。
But how to regress is still a problem that needs deeper study.
但由于柔性体碰撞问题的复杂性，目前的研究还有待深入。
The impact problem about flexible bodies has not deeply investigated because of its complexity.
当然本研究还有一些不足之处，很多问题还有待人们的深入系统研究。
However, there exist some shortcomings in the study, which requires more research into this field.
结语部分对本文研究结论进行简要回顾和总结，并指出有待深入研究的问题。
Then as a conclusion, in the fifth part, the paper proposed several research suggestions.
结语部分对本文研究结论进行简要回顾和总结，并指出有待深入研究的问题。
Then as a conclusion, in the fifth part, the paper proposed several research suggestions.
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