查询词典 metrically convex subset

The participants were fifth grade students and they were divided into high score group, middle score group, and low score group according to their achievement in the learning area of science and technology. There were two learning projects in two periods of experimental instruction with different participants: the first project was concave and convex lens and the second project was the investigation of sound and create instrument.

研究对象为国小五年级学生，以学生的自然与生活科技学习成就，将学生分为高分群、中分群、低分群，进行不同研究对象的二阶段实验教学，其学习主题：第一阶段为「凹透镜与凸透镜」，第二阶段为「声音的探讨与乐器制作」。

The second lens group includes a 2nd-group 1st positive lens, a 2nd-group 1st compound lens formed by joining a 2nd-group 2nd positive lens having a convex surface on the image plane side and a 2nd-group 1st negative lens having a concave surface on the screen side, and a 2nd-group 3rd positive lens arranged in that order from the screen side toward the image plane side.

第二透镜组包括一个第2组第一正透镜，一个由在像平面侧具有凸面的第2组第二正透镜和一个在屏幕侧具有凹面的第2组第一负透镜结合的第2组第一组合透镜，和一个第2组第三正透镜，它们以从屏幕侧到像平面侧的顺序布置。

As early as 400 BC for many years, China's "Mojing" documented book on the forward line of light, light reflection, as well as the plane mirror, concave mirror, convex imaging phenomenon.

早在公元前四百多年，我国的《墨经》一书就详细记载了光的直线前进、光的反射，以及平面镜、凹面镜、凸面镜的成像现象。

Hockney surmises, however, that this convex mirror could be turned around and used as a concave projection mirror: If you were to reverse the silvering , and then turn it round, this would be all the optical equipment you would need for the meticulous and natural-looking detail in the picture.

但霍克尼的猜测是，把这个凸面镜前后反转过来，便能当成可投射的凹面镜来用：「如果你把银涂在凸面镜的反面，并将它反转过来，就变成能做出精细自然画面的道具了。

That the clip boundary be convex where as the other object may be a concave non-self intersecting polygon.

该剪辑凸边界在与其他物体可能是一个凹非自相交多边形。

The implementation process of the algorithm is as follows: First, the scanning lines of each contour are generated, while the contour's shape can be divided into convex polygon and concave polygon, and the generating process of the scanning lines of each contour needs special treatments .

首先依次生成每个轮廓的轮廓扫描线，由于轮廓形状可能为凸多边形也可能为凹多边形，所以在生成各轮廓的扫描线时要增加一些特殊处理操作。

By decomposing each polygon into a set of several individual convex sub-polygons and constructing the map between the two sets, this method can solve the metamorphosis problem of two polygons which have not same topology(including concave polygon and holey polygon).

解决了任意非同拓扑结构的变形问题。

It is useful in many branches of mathematics analysis through the research of concave and convex functions.

对函数凹凸性的研究，在数学分析的多个分支都有用处。

In general, an industrial component may have both convex and concave portions as part of its boundary.

一般来说，工业组件可能有个凸，凹这两部分的一部分，它的边界。

This algorithm can be used for both the convex and the concave contours.

该算法同时适用于凸多边形和凹多边形，并具有较好的区分度和匹配准确性。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？