一些人推断，这种变化是由于水中的藻类，也许是因为池水中缺氯。
Several people have speculated that the change is due to algae in the water, perhaps because the pool is lacking in chlorine.
一些人推断，这种变化是由于水中的藻类，也许是因为池水中缺氯。
Several people have speculated that the change is due to algae in the water, perhaps because the pool is lacking in chlorine.
应用推荐