Shíyànyuán / bǎ / róngyè / dào / jìn / chángjǐngpíng / zhōng， / zài / mànmàn / jiārè。

实验员把溶液倒进长颈瓶中，再慢慢加热。

The laboratory technician poured the solution into a flask and then heated it slowly.