premise: A topless man straps surfboards on top of his blue car. hypothesis: A man secures surfboards on his car.
entailment: A topless man is a man and by him strapping/securing surfboards on his (blue) car.|entailment: A man secures his surfboards by strapping it on his car.|entailment: Straps is a paraphrase of secures, and topless man is a type of man.