算尺

qǐng měi cì lái shàng kè shí dài hǎo suàn chǐ

请每次来上课时带好算尺。

Please bring a slide rule to every class.

yī gè jiǎn biàn de shì lì shì yòng jì suàn qì dài tì suàn chǐ

一个简便的事例是用计算器代替算尺。

One handy example is the replacement of slide rules by calculators.