1
be a quadrangle
用于描述某物为四边形。
The plot of land is a quadrangle.
这块地是一个四边形。
四边形；四角形
先理解核心含义，再看它在真实句子里的用法。
四边形；四角形
a four-sided polygon; a quadrilateral
The plot of land is a quadrangle.
这块地是一个四边形。
四边形；四角四边的多边形。
A geometric shape with four angles and four straight sides; a four-sided polygon.
方形庭院。
A courtyard which is quadrangular.
庭院周围的建筑物。
The buildings forming the border of such a courtyard.
The students gathered on the grassy quadrangle between the library and the lecture halls.
学生们聚集在图书馆和教学楼之间的那片草地四方院里。
From my office window, I can see the old quadrangle where the trees bloom in spring.
从我的办公室窗户可以看到那座古老的四方院，春天里树木开花。
The tour guide pointed out the main quadrangle and its four covered walkways.
导游指出了主四方院及其四条有顶棚的通道。
用于描述某物为四边形。
The plot of land is a quadrangle.
这块地是一个四边形。
surrounded by 后接具体建筑，表示四周被建筑围合。
We walked through a quadrangle surrounded by lecture halls.
我们穿过一个被教学楼环绕的四方院。
the quadrangle 常特指某处的四方院，介词用 in。
Students often study in the quadrangle.
学生们经常在四方院里学习。
Not this
There are two beautiful quadrangle on campus.
Use this
There are two beautiful quadrangles on campus.
quadrangle 是可数名词，复数形式为 quadrangles。汉语没有规则复数标记，学习者容易漏掉 -s，所以须加复数词尾。
Not this
The students were playing in the rectangle.
Use this
The students were playing in the quadrangle.
quadrangle 作为名词可指“四方院、庭院”，而 rectangle 只表示几何图形“矩形”，不能指具体的庭院场所；表达学生活动的场地时应用 quadrangle。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
学院方院
The graduation ceremony took place on the college quadrangle.
毕业典礼在学院方院举行。
主方院；主庭院
The main quadrangle is surrounded by lecture halls and offices.
主方院四周是教学楼和办公室。
中央方院
A fountain stands in the central quadrangle.
中央方院里有一座喷泉。
正四边形
A square is a regular quadrangle with equal sides and angles.
正方形是边和角都相等的正四边形。
由建筑围成的方形庭院
The school is a quadrangle of buildings around a grassy yard.
这所学校是一座四面围楼的庭院，中间是草坪。
在方院里；在庭院中
We sat in the quadrangle and talked until sunset.
我们坐在方院里聊天，直到日落。
Use quadrangle naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：quad（四）+ angle（角）→ 四个角的四边形；也可联想大学里四面围楼的方形庭院（quad）。
语域：formal 常见场景：几何学、建筑/校园 quadrangle 较正式，通常用于几何或建筑语境；日常交流中四边形多用 quadrilateral，院落多用 courtyard。
angle、tangle、wrangle、mangle 均重读第一个音节，结尾为 /æŋɡəl/，彼此押韵；但它们与 quadrangle（/ˈkwɒdræŋɡəl/，重音在 /kwɒd/）不押韵。triangle 和 rectangle 只是拼写以 -angle 结尾，实际发音的结尾也为 /æŋɡəl/，但重音仍在第一个音节，不能与 quadrangle 押韵。注意：这些 -angle 结尾只是拼写相似，不表示同根词。
Dictionary facts from ECDICT, WIKTIONARY.