Article 29 : this contract and its enclosure come into effect upon both parties ' signature , with 4 copies ( two copies in chinese , two copies in english ) , each party keeps one copy each in either language 第二十九条本合同及附件经双方签字盖章后生效，一式四份（两份中文；两份英文） ，甲、乙双方执中、英文合同各一份。
