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解释一种几何图形,由圆的两个半径及其间的弧围成
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英语sector
圆的两半径和其所夹的圆弧所围成的图形称为扇形；有时，扇形也指这个图形与其内部的区域。如图所示者皆为扇形。
1. 扇形的面积计算公式是半径乘以中心角的一半再乘以π。
2. 她用扇形画出了一个美丽的花朵。
3. 扇形的弧长等于半径乘以中心角的度数除以360度。
4. 他喜欢用扇形来制作各种形状的手工艺品。
5. 扇形的周长等于两倍的半径加上中心角的度数乘以半径再除以2。
sector-部门; 领域; 防御地区; 扇形;
1.They fanned out and carefully combed the temple grounds.
他们呈扇形散开，在寺庙周围仔细搜寻。
柯林斯例句
2.The troops stormed the enemy's trenches and fanned out across the fields.
部队猛攻敌人的战壕,并在田野上呈扇形散开.
《简明英汉词典》
3.The sector dam broke and its water drowned the entire valley.
扇形水坝倒塌了,水淹没了整个山谷.
《简明英汉词典》
4.He fanned out the cards in his hand.
他把手中的纸牌呈扇形展开.
《简明英汉词典》
5.Kurt picked up his hand and fanned out the cards one by one.
库尔特拿起他那手牌，一张张成扇形铺开。
柯林斯例句
6.She fanned the money in her hand and began to count.
她把手中的钱展成扇形开始点数.
辞典例句
7.The troops stormed the enemp's trenches and fanned out across the fields.
军队猛攻敌人的战壕,并在战场上呈扇形散开.
辞典例句
8.There are numerous deep tidal channels herefanning out landward.
这里有许多深深的潮汐水道向着陆地成扇形分布.
辞典例句
9.He fanned ( out ) the cards in his hand before playing.
他出牌前先把纸牌在手里展成扇形.
辞典例句
10.The scattered particles are fanning out from the target.
散射粒子从靶处作扇形散开.
辞典例句
11.The soldiers fanned out across the hillside.
士兵们成扇形散开在山坡上.
辞典例句
12.The troops fanned out across the fields.
部队在战场上成扇形散开.
辞典例句
13.The party spread itself abroad , in a fan shape, shouting and leaping to and fro.
海盗们上岸后就成扇形散开, 叫喊着蹿来蹿去.
英汉文学 - 金银岛
14.They were no longer ruffled but were gathered up in scalloped festoons, showing braided petticoats beneath.
它们已不用皱边,而是做成扇形的花边折叠在一起, 把底下镶有带的衬裙露出来.
飘（部分）
15.These basic system are referred to as radiating, harp, fan, and star systems.
这些基本体系归类为:辐射形, 竖琴形 、 扇形和星形体系.
辞典例句