jìlùpiàn / jièshào / le / shí rén shā / de / tǐxíng / xíxìng / yǐjí / tā / zài / hǎiyáng / shēngtài / zhōng / de / zuòyòng纪录片介绍了食人鲨的体形、习性以及它在海洋生态中的作用。The documentary introduced the great white shark's body shape, habits, and role in the marine ecosystem.