An algorithm of 3-axis interference-free tool path is researched and realized by cutter location surface and protection surface of discrete triangular facets of machined surface.

介绍和扩大了数控加工中的刀位面和保护面的概念，研究和实现了一种基于曲面离散生成三轴加工无干涉刀具轨迹的算法。

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"The thing is, whales do not have hair, fur or feathers that could offer some protection, and they are forced to surface in order to breathe," co-author Karina Acevedo-Whitehouse told Discovery News.

“问题是，鲸鱼没有用以保护的毛发、毛皮或羽毛，而且它们为了呼吸，要被迫浮出水面，”合著人卡琳娜。阿塞维多·怀特豪斯这样告诉探索频道新闻。

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On the surface, the principles of majority rule and the protection of individual and minority rights would seem contradictory.

从表面看，多数决定与保护个人和少数派权利的原则似乎相互矛盾。

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To explore the surface of the moon, astronauts must be able to survive outside the protection of their spacecraft.

VOA: special.2009.07.01

The ocean accounts for 70% of the surface of the Earth, but only one percent of their area benefits from protection.

UNESCO: Indigenous Peoples