premise: Two men in workers' gear and colorful hard hats standing on board what appears to be a large ship, next to some very large machinery. hypothesis: two men in workers gear are on a large ship with machinery.
entailment: There are two men in workers' gear on board a large ship with machinery.|entailment: If the men are on board and they are next to machinery, it is logical the machinery is also on the ship.|entailment: On board a large ship is a paraphrase of on a large ship.