所述内金属件与所述外金属件都可包括至少一个渐缩端或梯形端。
Both the inner metal piece and the outer metal piece may include at least one tapered end.
投影网格的目的是用存在于投影空间的网格代替传统的存在于世界空间的规则矩形网格或梯形网格，使网格采样过程符合人眼视线规律的自然属性。
The projective grid, whose sampler takes the view rule of human eyes into account, is designed to use the grid in projective-space to take the place of the traditional grid in world-space.
1914年，一位名叫卡尔▪维塞尔斯伯格的德国研究员发表了一篇具有重大意义的论文，科学家们从中得知，鸟类在飞行的时候排成 V 字、梯形或倒过来时，会节省体力。
Since 1914, and a seminal paper by a German researcher called Carl Wieselsberger, scientists have known that birds flying in for mation—a V -shape, echelon or otherwise—expend less energy.
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