A: The reasons why the water-shooting fish can strike accurately are: ① knowing how to adjust the direction of the water column with the tip of the tongue; (2)1sec can spray water continuously for 5 times; (3) Several companions attack a prey at the same time, which is often more powerful; (4) Shooting fish usually sprays ten times the energy needed to knock down prey.
2. Can the words in brackets in the following sentences be deleted? Why?
(1) If necessary, they can even be sprayed five times in a row (within 1 second).
A: It cannot be deleted. Because the words in brackets explain the short time of spraying five times in a row, this highlights the high ability of water-shooting fish.