内容正文：
Guess the Scientific Invention
Test your knowledge of science and inventions!
How to Play
You will see 6 invention images,one at a time.
You have 15 seconds to choose the correct name.
Three English keywords will appear gradually as hints (at 12s,8s,4s left)
After each question,learn the scientific principle behind the invention.
You can click to listen to the principle in English.
Start Game