Subject + 可以 + 流动
流动 (liúdòng) means "to flow" or "to move as a fluid," describing the movement of liquids or, figuratively, people and capital. For example, 液体可以流动 means "liquids can flow."
河水在山谷之间缓缓流动。
héshuǐ zài shāngǔ zhī jiān huǎnhuǎn liúdòng.
The river flows slowly between the valleys.
这座城市的流动人口非常多。
zhè zuò chéngshì de liúdòng rénkǒu fēicháng duō.
This city has a very large floating population.
空气在房间里自由流动,感觉很舒服。
kōngqì zài fángjiān lǐ zìyóu liúdòng, gǎnjué hěn shūfu.
Air circulates freely in the room, and it feels very comfortable.