ruler的複數形式怎麼寫

例句：

His guitar makes a noise like a wooden ruler being twanged upon a desk

他的吉他發出一聲彷彿木尺彈在課桌上的噪音。

He cracked me on the head with a ruler.

他用尺子猛擊我的頭部。

The ruler cracked and splintered into pieces

尺子裂開了，碎成了小片。