lǎo / shī / ná / chū / yì / bǎ / jì / suàn / chǐ / xiàng / xué / shēng / jiǎng / jiě / tā / de / shǐ / yòng / fāng / fǎ

老师拿出一把计算尺，向学生讲解它的使用方法。

The teacher took out a slide rule and explained how to use it to the students.