Paleontologists know chert as a good place to look for fossils.古生物学者知道黑矽石同样的好地方去观看化石.The fossils appear to be an early form of seaweed washed up on a beach.这些化石看上去是被海水冲上岸的一种早期的水藻。The geologist found many uncovered fossil...
Seventeen thousand Indians live in Arizona on a reservation.1.7万印第安人生活在亚利桑那州的保留地。You make the reservation, and I'll confirm it in writing.你来预订，我会去函确认。I told him my main reservation about his film was the ending.我告诉他...