2018-2019学年外研版高一英语必修4教学课件:Module 4 Reading and Vocabulary(Ⅱ)
2018-2019学年外研版高一英语必修4教学课件:Module 4 Reading and Vocabulary(Ⅱ)第3页

Archimedes (阿基米德)

Which scientist discovered that objects in water are lifted up by a force that helps them float?

Ancient Greek (287BC-212BC)

a mathematician

Leading-in