lǎo / shī / ná / qǐ / kuò / yīn / jī / ràng / cāo / chǎng / shàng / de / xué / shēng / dōu / néng / tīng / jiàn

老师拿起扩音机，让操场上的学生都能听见。

The teacher picked up a loudspeaker so all the students on the field could hear.