Nine is a square number.

九是一个平方数。

He's always had a square jaw, but now he's grown a beard.

他一直有方下巴，但现在他留了胡子。

I love its silky softness when it's folded to a square.

我喜欢它折成方形时的丝滑柔软。

He drew a square picture.

他画了一幅方形的图画。

She bought a square table.

她买了一张方形的桌子。

Draw a square on the paper.

在纸上画一个正方形。

Cut the fabric into a square.

把布料剪成一个正方形。

He drew a square on the paper.

他在纸上画了一个正方形。

We drew a square on the paper.

我们在纸上画了一个正方。

A square wave is a common waveform.

方波是一种常见的波形。