What does Exodus 8:5 mean?

And Jehovah said unto Moses, Say unto Aaron, Stretch forth thy hand with thy rod over the rivers, over the streams, and over the pools, and cause frogs to come up upon the land of Egypt.

And the Lord spake unto Moses, Say unto Aaron, Stretch forth thine hand with thy rod over the streams, over the rivers, and over the ponds, and cause frogs to come up upon the land of Egypt.

And Jehovah said unto Moses, Say unto Aaron, Stretch forth thy hand with thy rod over the rivers, over the streams, and over the pools, and cause frogs to come up upon the land of Egypt.

And the Lord said to Moses, Say to Aaron, Let the rod in your hand be stretched out over the streams and the waterways and the pools, causing frogs to come up on the land of Egypt.

And Jehovah saith unto Moses, `Say unto Aaron, Stretch out thy hand, with thy rod, against the streams, against the rivers, and against the ponds, and cause the frogs to come up against the land of Egypt.'

And the Lord said to Moses: Say to Aaron: Stretch forth thy hand upon the streams, and upon the rivers and the pools, and bring forth frogs upon the land of Egypt.

And Jehovah said to Moses, Say unto Aaron, Stretch out thy hand with thy staff over the streams, over the rivers, and over the ponds, and cause frogs to come up on the land of Egypt.