lǎo / shī / bǎ / chèng / háo / de / wèi / zhì / zhǐ / gěi / xué / shēng / kàn / bìng / jiě / shì / tā / rú / hé / bāng / zhù / dú / chū / zhòng / liàng

老师把秤毫的位置指给学生看，并解释它如何帮助读出重量。

The teacher pointed out the position of the steelyard's lifting cord and explained how it helps determine the weight.