quad
[kwɑ:d]
n.
四倍;
空铅;
（大学的）四周有建筑物围绕的方院;
四胞胎之一;
vt.
在…填补空铅;
例句:
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We have been quad-biking, trampolining and abseiling!
来自BBC
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His rooms were on the left-hand side of the quad.
他的房间位于四方院的左侧。
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That evening I went across the quad to visit Collins.
当天傍晚,我穿过院子去找科林斯.
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The front quad, where I lived, was floored and tented.
在我居住的四方院子的前排楼房下已经铺起地板,支起帐篷.
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You are negative red on the step-function quad.
来自NEWYORKER
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Peter Norfolk in the quad division represents the best medal chance.
来自BBC