Subject + 投下 + Object
The verb 投下 (tóuxià) means 'to cast down' or 'to throw down,' describing the action of projecting or dropping something downward. It combines 投 (to throw) and 下 (down). It is commonly used to describe casting shadows, dropping bombs, or figuratively making investments.
夕阳投下长长的影子,景色非常美。
xīyáng tóu xià cháng cháng de yǐngzi, jǐngsè fēicháng měi.
The setting sun cast long shadows, and the scenery was very beautiful.
飞机在城市上空投下了救援物资。
fēijī zài chéngshì shàngkōng tóu xià le jiùyuán wùzī.
The airplane dropped relief supplies over the city.
路灯在地面上投下一圈昏黄的光。
lùdēng zài dìmiàn shàng tóu xià yī quān hūnhuáng de guāng.
The streetlight cast a circle of dim yellow light on the ground.