But it was necessary to make an objective test, which required the use of the touchstone and bars. A touchstone is a black stone which can be found near the sea.
然而要進一步作客觀的鑒定，讓那些拿著金球來賣的小伙子心服口服，就非得靠試金棒和試金石了。試金石是一塊海邊揀來、再磨得很平的黑石頭。