1
a heptagon
不定冠词 a 用于泛指一个七边形。
A heptagon has seven sides.
七边形有七条边。
七边形
先理解核心含义，再看它在真实句子里的用法。
七边形
a polygon with seven sides and seven angles
A heptagon has seven sides.
七边形有七条边。
有七条边和七个角的多边形。
A polygon with seven sides and seven angles.
七边形
a seven-sided polygon
The students learned that a heptagon has seven equal sides.
学生们了解到一个七边形有七条相等的边。
He drew a regular heptagon on the blackboard.
他在黑板上画了一个正七边形。
The building's base is designed as a heptagon.
这座建筑的底部被设计成一个七边形。
不定冠词 a 用于泛指一个七边形。
A heptagon has seven sides.
七边形有七条边。
regular 表示所有边和角相等。
A regular heptagon has equal sides and angles.
正七边形的边和角都相等。
用 of 结构描述七边形的属性。
The interior angles of a heptagon sum to 900 degrees.
七边形的内角和为900度。
动词 draw 或 construct 表示画或构造。
You can draw a heptagon using a compass and straightedge.
你可以用圆规和直尺画一个七边形。
Not this
The shape is a hexagon.
Use this
The shape is a heptagon.
误将“heptagon”（七边形）与“hexagon”（六边形）混淆。两个词前缀不同，hept-意为“七”，hex-意为“六”。
Not this
This is a heptagon table.
Use this
This is a heptagonal table.
“heptagon”是名词，不能直接修饰名词。描述“七边形的”应使用形容词形式“heptagonal”。
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页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.