the philosopher’s stone
noun /ðə fəˌlɒsəfəz ˈstəʊn/
/ðə fəˌlɑːsəfərz ˈstəʊn/
[singular]- an imaginary substance that, in the past, people believed could change any metal into gold or silver, or could make people live forever
点金石,哲人石(旧时被认为能使其他金属变为金银或能使人长生不老的仙石)