A joint venture between two american companies , american bridge and fluor enterprises , won the prime contract for the project in early 2006 .
早在2006年,两家美国公司,美国桥梁和萤石企业,以合资的方式赢得了工程的早期合约。
To ensure the bridge meets safety standards , 250 employees and consultants working for the state of california and american bridge / fluor also took up residence in shanghai .