Paper Planes

To study the intersection visibility of two general place planes, this paper set the planes as two faces of front and backs from the point of projection character of a space plane.

为了研究两平面相交可见性的规律，从空间一个平面的投影特点入手，将平面分别设定为正面、背面两面，讨论平面图形各顶点投影顺序与平面正面、背面的投影所具有的内在规律。

Then we stood on the bridge and flied three paper planes.

接着我们站在桥上放了三只纸飞机。

According to the data analysis of erosion and damage of a cannon barrel, the paper locates the characteristic planes of erosion and abrasion, and then uses several characteristic planes to describe the change of interior ballistics.

通过对某加农炮的身管烧蚀磨损特征数据进行分析整理，确定了身管烧蚀磨损特征面，采用了多特征面来表述火炮内弹道性能变化。

i'm thinking birdhouses, step stools, go-karts, kites and paper planes.

我能想到的有鸟屋、梯櫈、小型赛车、风筝和纸飞机。

Twenty-seven-year-old Russian millionaire Pavel Durov has earned himself plenty of new critics today after it was reported the mogul threw "paper planes" made of money from the windows of his St. Petersburg office into a growing crowd of pedestrians below.

27岁的俄罗斯百万富翁巴维尔•杜罗夫近日突然从其圣彼得堡的办公室窗口向街上行人撒下用钱折成的“纸飞机”，引起越来越多的路人哄抢，招致非议。

Vice Schoolmaster: Why are here so many paper planes?

副校长：怎麽有这麽多纸飞机。

In the air, the Japanese airline ANA will launch three planes bearing the likenesses of R2-D2 and another robot beginning next month and promises more "Star Wars" theming inside, including possibly headrest covers, paper napkins and cups.

从下月起，日本航空公司全日空（ANA）将启用三架外形模仿R2-D2和另一个机器人的飞机，并承诺在机舱内布置更多《星球大战》主题的用品，包括头靠外罩、纸巾和杯子。

"since i was about 4 years old, i've been able to make really good paper planes and commit the steps to memory, " toda says.

户田拓夫说：“从四岁开始，我就能折出很好的纸飞机，并且能记住制作的步骤。”

They threw into classrooms answers written on paper planes or simply passed study material on to other people walking in and out of the classrooms.

这些家长有的将写有答案的纸飞机扔进考场，有的干脆直接把学习资料递给进出教室的人。

On the basis of the research on deformation, genetic mechanism and major induced factors for deformed body of the Nankan landslide, this paper determines 2 sliding planes, infers 5 potential sliding surfaces, calculates thrust, fixes pile location, and works out comprehensive control programme.

在深入研究南龛斜坡变形破坏特征、成因机制、主导诱发因素的基础上，确定了2个已有滑动面，推断了5个可能的潜在滑动面，并进行了推力计算；确定了治理设桩位置；