空间形式上的曲面论，尤其是对某一特殊曲面的构造和分类是微分几何中的一个重要而有趣的课题。
The surface theory in the space form, especially, the construction and the classification of a special surface is an important and interesting problem.
然后分析了界面端线和界面端点处附近奇异性指数，得到了一些重要而有趣的结果。
The index of singularity along the stress singularity line and at the vertex are analyzed, and some important and interesting results are obtained.
孩子喜欢做有常规的事情，每天花上一点时间和孩子一起阅读，会让他觉得读书是一件非常重要而有趣的事。
Children love routine, and reading is something that you and your child can look forward to every day.
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