在什么条件下两个分歧问题关于某一等价群而言是等价的，这在分歧理论研究中是很有意义的。
An interesting problem in the study of bifurcation theory is to determine when two bifurcation problems are equivalent with respect to some group of equivalences.
本文运用安全池破损理论研究了由两个正弦波组成的波群和随机波作用下的船舶横摇。
In this paper, we will use the theory of safe basin to examine ship's rolling under waves composed of two sinusoidal wave and irregular wave.
然后，通过定量和定性的方法，从理论和现实两个方面阐述了环渤海湾港口群合作的必要性和可能性。
Thirdly, the necessity and possibility of the cooperation among harbors around the Bohai Bay are expounded through descriptive and qualitative method both in theory and practice.
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