Subject + 掉入 + Place/Object
The verb 掉入 (diàorù) means "to fall into" or "to drop into," describing the action of something or someone descending into a space or body of something. It carries a sense of unintended or sudden falling. For instance, 掉入大海 means "to fall into the sea."
那个孩子不小心掉入了河里。
Nàge háizi bù xiǎoxīn diào rù le hé lǐ.
That child accidentally fell into the river.
手机从口袋里滑出来,掉入了水中。
Shǒujī cóng kǒudài lǐ huá chūlái, diào rù le shuǐ zhōng.
The phone slipped out of the pocket and fell into the water.
他一脚踩空,差点掉入坑里。
Tā yì jiǎo cǎi kōng, chàdiǎn diào rù kēng lǐ.
He missed his step and almost fell into the pit.