ZH_zh_obs-tn/content/03/11.md

dove

A small, white or gray flying bird that eats seeds or fruit.

olive branch

An olive tree's fruit contains oil which people use for cooking or putting on their skin. If your language does not have a word for "olive branch," you could translate it as, "branch from a tree called 'olive'" or, "branch from an oil-tree."

water was going down

It may be more natural in your language to say that, "the water was going away" or, "the level of the water was getting lower."