英语翻译证明：为了确保双方利益的最大化,如我公司在收到合同总货款的50%后,6个月内价格会维持不变.即：100元.再加一句：特此证明

Certificate
This is to certify that in order to ensure maximized interests for both sides,we shall stay at the quoted price,i.e.RMB 100,without any adjustment within six months following our receipt of over 50% of the total amount of the contract.