Defines arcs and ellipses and identifies the classes needed to draw them.

It allows the user to produce arcs, circles and even lines.

它允许使用者绘制弧线 、 圆甚至直线.

Recent algorithms of recognizing arcs are mainly about approximation with lines.

传统的圆弧识别多是基于线段逼近.

The paper expounds the ARCS model and the design method of teaching software based on ARCS.

本文详细阐述了ARCS模型以及基于ARCS模型 的教学软件的设计与实现方式.

The individual arcs cannot be rectified.

单个弧是不能求长的.

The arctic tundra is at the top of the world around the North Pole.

北极冻原是指北极点周边的地区,是世界最高的地方.

We are not very forward with our preparations for our Arctic expedition next year.

我们为明年北极探险所做的准备工作进展不快.

The Greenpeace flagship is voyaging through the Arctic cold of the Barents Sea.

绿色和平组织的旗舰正在穿越巴伦支海的北极寒冷地带。

The explorers spent months in the Arctic wastes.

探险家们在北极荒原上工作了几个月.

Have you been to the Arctic?

你到过北极 吗 ?

The conditions were arctic.

周围环境极冷.

These were my Arctic adventures.

这就是我的北极冒险经历.

The Arctic remains the domain of the polar bear.

北极仍是北极熊的领地.

Cold and hungry, they drifted helplessly towards the Arctic.

他们又冷又饿, 无助地漂向北极.

They flew over the unlimited reaches of the Arctic.

他们飞过了茫茫无边的北极上空.

This ship was designed expressly for exploring the Arctic waters.

这艘船是为考察北极水域而特意设计的.

TV pictures showed the arctic conditions.

电视画面显示了严寒的环境。

Water and sky form a blue canvas for boreal forest in the Arctic Circle.

北极圈的水和天空构成了一张蓝色的帆布映衬着北方针叶林.

I especially like the white ones, the Arctic foxes which live in Arctic Circle.

我特别喜欢白色的, 北极狐是在北极圈生活.

There is a Santa Claus village at the Arctic Circle Rovaniemi in Lapland in Finland.

在芬兰极北的拉普兰的柔曼尼米极圈有个圣诞老人村.

In Sweden, there is a hotel built of ice, which lies in the Arctic Circle.

瑞典有一座用冰建造的旅馆, 位于北极圈内.