并列题名：Da Vinci in 30 seconds 并列题名：Science in 30 seconds 并列题名：Vikings in 30 seconds 并列题名：Earth in 30 seconds 并列题名：Space in 30 seconds Da Vinci in 30 seconds 并列题名：Maths in 30 seconds 并列题名：Oceans in 30 seconds 并列题名：Inventions in 30 seconds leonardo da vinci in 30 seconds