lǎo / shī / fā / gěi / měi / wèi / xué / shēng / yì / zhāng / àn / shè / dì / tú / ràng / dà / jiā / biāo / chū / zhǔ / yào / hé / liú

老师发给每位学生一张暗射地图，让大家标出主要河流。

The teacher gave each student a blank map and asked them to mark the major rivers.