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on the quad
quad 是 quadrangle 的简称，指四周有建筑的方形庭院，常见于学校或大学校园。
Students often eat lunch on the quad.
学生们经常在四方院子上吃午餐。
四方院子；方形庭院
quads — plural of quad
先理解核心含义，再看它在真实句子里的用法。
四方院子；方形庭院
quad
Students often eat lunch on the quad.
学生们经常在四方院子上吃午餐。
通常数量、数目等的四倍。
Something that is quadruple (four times) the usual amount, number, etc.
quadruplet的缩略形式,意为“四件套；四件套中的一个”。
Clipping of quadruplet (“a set of four; one of a set of four”).
能量单位,等于一千兆英热单位(10^15 BTU)。
A unit of energy equivalent to a quadrillion BTU (1015 BTU).
小型四轮越野机动车,通常用于休闲或农务。
A small off-road four-wheeled powered vehicle, usually used for recreation or farm work.
Students were sitting on the grass in the quad between classes.
课间，学生们坐在四方院子的草地上。
The old university has a beautiful quad with a fountain in the middle.
这所古老的大学有一个漂亮的四方院子，中间有喷泉。
We walked across the quad to reach the library.
我们穿过四方院子去图书馆。
quad 是 quadrangle 的简称，指四周有建筑的方形庭院，常见于学校或大学校园。
Students often eat lunch on the quad.
学生们经常在四方院子上吃午餐。
在印刷排版中，quad 是可数名词，指用于填充空白或分隔词语、句子的无字铅块。
Insert a quad between the two words.
在两个单词之间插入一个空铅。
Not this
The graduation ceremony was held in the town quad.
Use this
The graduation ceremony was held in the town square.
quad 指校园或建筑群中四面有建筑围起来的方形庭院，不是城市广场；表示城市广场应用 square。
Not this
She gave birth to a quad earlier this month.
Use this
She gave birth to quads earlier this month.
quad 作“四胞胎之一”讲时是可数名词，指四个孩子中的一个；表示一次生下四个孩子这个整体时须用复数 quads，不能用单数 a quad。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
大学方院
Students were relaxing on the grass in the college quad.
学生们在大学方院的草地上休息。
主方院
The main quad is surrounded by old brick buildings.
主方院四周是古老的砖楼。
全身空铅
A printer uses an em quad for a full-width space.
印刷工人用全身空铅作为全角空格。
半身空铅
An en quad is half the width of an em quad.
半身空铅的宽度是全身空铅的一半。
同卵四胞胎
She gave birth to identical quads.
她生下了同卵四胞胎。
四倍伤害！
Announcer line in the video game Quake III Arena when a player picks up the Quad Damage power-up, which temporarily lets the player deal four times as much damage.
电子游戏《雷神之锤3：竞技场》中，玩家拾取四倍伤害道具时播报员喊出的台词，该道具能让玩家在短时间内造成四倍伤害。
Use quads naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
quad 的核心是“四”：四方院子、四胞胎、四芯导线都离不开“四”，想象一个四四方方的庭院。
语域：mixed 常见场景：university campus、printing quad 的语域视场合而定：在校园等场所指“四方院子”时，多用于口语；在印刷排版中指“空铅/铅块”时，属于专业术语。实际使用时可根据语境选择。
名词 quad 的复数形式是 quads。
Dictionary facts from ECDICT, WIKTIONARY.