The scientists think the migrants brought along advanced stone tools called microliths.
科学家们认为移民带来了称为微石器的先进石器。
英语百科
Microlith
A microlith is a small stone tool usually made of flint or chert and typically a centimetre or so in length and half a centimetre wide. They were made by people from 35,000 years ago to about 3,000 years ago, in Europe, north Africa, across Asia and in Australia, and used in spear points and arrowheads.