"Obelisks" (tall four-sided tapered monuments) were carefully constructed and even purposefully geographically located around 3500 BC.

“方尖碑”（高大的四边锥形纪念碑）是在公元前3500年精心建造的，甚至在地理位置上也是有目的的。

youdao

You can easily draw four-sided polygons in Processing with quad.

在Processing内使用quad可以很容易地绘制有四个边的多边形。

youdao

For instance, mandating a four-sided fence around a pool can decrease risk of drowning.

例如，强制规定水池加装围栏可以减少溺水的危险。

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The main part of his design is a four-sided pyramid.

VOA: special.2010.05.30

These areas had been touched, tagged on the four-sided chart inside his personal ledger, then washed clean of ink and forgotten.

NEWYORKER: Backbone

Once the action is underway the crowd is kept in darkness, similar to watching a football match under floodlights, but they are kept in touch with match statistics and disputed line call replays on a giant four-sided screen above the court.

CNN: How tennis aced austerity

In the dining room there's a five-panel Egyptian pictograph spanning the length of one wall. (As with many of his objects, Mr. Davis said he got it in a barter deal, trading it with the publisher of a popular book series for the use of his music.) At the center of the home is a 44-foot-tall, four-sided fireplace.

WSJ: The Mannheim Steamroller Founder's Wild Holiday Home