This is certainly true for a plane mirror but it is only approximately the case for other configurations . 对于平面镜这肯定是对的，但是对于其它形状的反射镜则情况只是近似如此。
the quantities baβ are the covariant components of a plane tensor, called the curvature tensor of the surface. ba是“平面张量”的协变分量，叫做该曲面的曲率张量。
Dehn showed how a presentation of the group of a knot can be read off from a projection of the knot into a plane . Dehn指明了一个纽结的群的一种表示如何由该纽结在平面上的一个投影看出。
We can search the coastline right away and survey the sea as soon as the weather clears sufficiently for us to get a plane up . 我们可以马上沿海岸进行搜查，天气一放晴就派飞机侦察海面。
The same considerations apply to the correct banking angle of a plane when it makes a turn in level flight . 当水平飞行的飞机转弯时，同样应有一定的倾斜，倾斜角的大小可按与上面相同的考虑来决定。
When a plane from london arrived at sydney airport , workers began to unload a number of wooden boxes which contained clothing . 当一架飞机从伦敦到达悉尼机场时，工人们开始卸下大批装有衣服的木箱。
A projection is defined as any orderly system whereby the meridians and parallels of the spheroid may be represented on a plane . 投影是一种有规律的方法，用来把椭球面上的子午圈和平行圈映射在一个平面上。
Any two vector which are parallel in a plane may still be considered as parallel when this plane is wrapped around a cylinder . 当把一个平面贴线在一个柱曲面上时，原来平面上互相平行的任何两个矢量仍可以看作是平行的。
Admittedly, it is not at all obvious that by now shining a plane wave through the processed hologram one could reconstruct an image of the original object . 当然，我们还根本看不出，用一个平面波照射处理后的全息图，为什么能再现原来物体的一个象。
For vlsi, a plane surface may be approximated by depositing the interlevel dielectric by bias-sputter deposition (see section 9. 2. 4) or by using planarization . 对于超大规模集成电路的平面状表面，可以用偏置溅射淀积法的层间介质淀积（见924节）或用平面化工艺来近似获得。
