他用枝条在沙地上画了一个圆。

He drew a circle in the sand with a stick.

《牛津词典》

她的头发稀疏、淡黄，往后梳成了一个圆髻。

She had pale thin yellow hair she pulled back into a bun.

《柯林斯英汉双解大词典》

看，这是一个圆猕猴桃。

Look, it's a round kiwi fruit.

youdao

During this part, when you're doing a quarter of a circle, this is supposed to be a quarter of a circle.

在这部分,当你沿着四分之一圆运动,这就是个一个圆的四分之一

耶鲁公开课 - 基础物理课程节选

Try to imagine-- can you do that or can you not do that?-- try to imagine a round square.

试着去想象,你可不可以这样,试着去想象一个圆的方形

耶鲁公开课 - 死亡课程节选

And this dimple is later forming a vesicle, a round ball, that goes on and forms the ear.

随后形成一个圆球状的泡囊，直至发育成耳朵。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选