金矿并非无底的宝藏，金子终究会被采光。A gold mine is not a bottomless pit, the gold runs out.每年他们淘出大约1.5吨金子。Every year they panned about a ton and a half of gold.金子的发现吸引了大量的勘探者进入这些地区。The discovery of gold brought a flood of prospectors int...
Paleolithic man could only make the most basic stone tools.旧石器时代的人类只能制造最简单的石器.the ethnography of paleolithic humans旧石器时代的人种研究The Upper Paleolithic , in contrast , ushered in a suite of sophisticated practices.旧石器时代晚期就不一样...