签订的合同要海牙认证（海牙认证是什么？）
The contract signed should be Hague certified (WHAT is Hague certification?
合同需要一式两份
The contract should be made in duplicate
合同要盖章签字，如果加页要标注页码或者是加盖骑缝章
The contract should be sealed and signed, and if pages are added, the page number should be marked or the riding seal should be affixed
需要营业执照副本一份
A copy of business license is required
需要把合同翻译成英文形式
The contract needs to be translated into English

海牙认证的优势：
海牙认证使用地点是十分广泛的，当前全球上百个国家承认海牙公约，
The Hague certification is widely used. At present, hundreds of countries in the world have recognized the Hague Convention.
海牙认证好的文件都可以使用，在海牙协约国之间是不限制使用地点的，
Documents certified by the Hague are available, and there is no restriction of location between the Allies of the Hague,
可以多个地点使用，这是海牙认证的优势之一。
It can be used in multiple locations, which is one of the advantages of Hague certification.