River flowed swiftly downstream.
Meaning: This sentence describes the river moving quickly in the direction it flows.
Choice of Words: River is a natural stream of water flowing in a channel. Flowed means to move or run in a continuous stream. Swiftly suggests a rapid or fast movement. Downstream refers to the direction in which a river flows. "River flowed swiftly downstream" depicts the river moving quickly in the direction it flows.
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