研究人员研究沙特阿拉伯的古代王国

kingdom -- n. a country whose ruler is a king or queen

tomb – n. a building or chamber above or below the ground in which a dead body is kept

carve -- v. to make (something, such as a sculpture or design) by cutting off pieces of the material it is made of

route -- n. a way that someone or something regularly travels along

diversify -- v. to change (something) so that it has more different kinds of people or things

preserve – v. to keep (something) in its original state or in good condition