功能各异的螺旋相继出现，从而对螺旋进行分类就显得十分必要。
Torseurs of different functions have appeared one after another, so to classify them is very necessary.
因此，构建一种新型的师生关系使其归归人的存在就显得十分必要。
So it is necessary to build new relation between teachers and students to return to human existence.
因此，加强对集装箱码头装卸设备优化配置的研究就显得十分必要和迫切。
Therefore it is quite necessary and urgent for strengthen the investigation of how to optimize the configuration of port stevedoring equipment.
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