52.与……有贸易交流have trade link with

51.提醒某人某物 remind sb of sth

50.古代　　 in ancient times

49.充当　　 serve as

48.(也)不有大量的象牙

as well as a large quantity of ivory

47.在泥土中发现了象牙和巨石

　find ivory and jade in mud

46.建筑工人　　 construction workers

45.闻名于中国　

become famous all over China

44.在苏格兰长大grow up in Scotland

43.把画钉到墙上

pin the picture to the wall